Brian Dykes
Executive Vice President and Chief Financial Officer at United Parcel Service
Thank you, Carol, and good morning, everyone. First, I'm very thankful for the opportunity to lead the global finance organization and work with the entire leadership team to achieve the targets we've set. We have a lot of opportunity in front of us and the right team to achieve our goals. I'm also particularly eager to meet our investors as I hit the road over the next few weeks. This morning, I will review our second quarter results, provide an update on capital allocation, and lastly, provide additional detail for our 2024 financial outlook.
First, our results. The second quarter represented an important turning point for our business. In the U.S., volume inflected positively and it was the last full quarter of the high wage growth rate associated with the first year of our new Teamsters contract. Outside the U.S., we saw pockets of demand improved in each export region, driving growth in many of our more profitable lanes. Additionally, through our Fit to Serve initiative, we reduced our workforce by over 11,500 positions, which is translated into approximately $350 million in savings for the first half of 2024. And as Carol said, we are on track to deliver roughly $1 billion in savings by the end of the year.
Looking at our consolidated performance, in the second quarter, revenue was $21.8 billion, a reduction of $237 million compared to the second quarter of 2023. Consolidated operating profit was $2.1 billion, down 29.3%, and consolidated operating margin was 9.5%. Diluted earnings per share was $1.79, down 29.5% from the second quarter of 2023.
Now let's look at our business segment. In the second quarter, U.S. average daily volume increased 0.7% year-over-year. This marks a return to positive volume growth for the first time since the fourth quarter of 2021. And sequentially when compared to the first quarter of 2024, the average daily volume year-over-year growth rate increased by 390 basis points. At the beginning of the year, we expected to see three things in the second quarter, volume growth, growth in B2C, and relatively consistent product mix to what we had experienced last year. While we saw strong volume growth in the second quarter led by B2C, it came with a different product mix. For the quarter, B2C volume increased 4.8% year-over-year and made up 58.5% of our volume, an increase of 220 basis points from a year ago. This growth was driven in large part by several new e-commerce customers that entered our network. B2B average daily volume finished down 4.6%, but returns remained a bright spot and increased 3% year-over-year.
From a product perspective, we saw customers trade down between services. Specifically, we saw customers shift from air to ground and from ground to SurePost. As a result, total air average daily volume was down 7.8%. By ground, average daily volume increased 2.3%. Within ground, SurePost average daily volume grew 25%, driven by new shippers' product choices, product trade-downs and easier comparisons due to last year's decline in volume during our contract negotiations. By enhancing our matching algorithm, we saw an increase in the percentage of SurePost packages redirected to UPS for delivery. As a result, SurePost redirect increased, returning to 2020 level.
Turning to SMBs. We saw the trend from the first quarter continue with total SMB volume down until June when it flipped positive. And in terms of total volume, SMBs made up 29.7% in the second quarter. For the quarter, U.S. Domestic generated revenue of $14.1 billion, down 1.9% compared to last year. Revenue per piece was down 2.6% year-over-year. Let me break down the components of the revenue per piece decline. Base rates increased the revenue per piece growth rate by 90 basis points. The combination of product mix, lighter weights and shorter zones decreased the revenue per piece growth rate by 310 basis points. The remaining 40 basis point decline in the revenue per piece growth rate was due to the combination of changes in customer mix and fuel.
Turning to costs. Total expense increased 3.2% in the second quarter. Union wage rates increased 11.7%, driven by the contractual increase that went into effect in August of last year. The U.S. Domestic team took several actions and executed on productivity initiatives to partially offset the increase in compensation rate. We leveraged total service plan and network planning tools to reduce total operational hours by 1.4%, while volume grew 0.7%. Through Network of the Future, we had 17 operational closures in the second quarter, bringing our year-to-date total to 35. And because we're routing more volume through our automated facilities, we've permanently closed five buildings so far this year.
We lowered block hours by 12.5% versus last year, and we recorded our best auto safety results in 10 years, driving a better outcome for our people and a better long-term cost picture for UPS. Putting it all together, due to the actions we took in the second quarter, we held the cost per piece growth rate to only 2.5% even as union wages increased nearly 12%. This is the lowest cost per piece growth rate we've seen in more than three years. The U.S. Domestic segment delivered $997 million in operating profit, down 40.7% compared to the second quarter of 2023, and the operating margin was 7.1%.
Moving to our International segment. The second quarter was a turning point for our International business as well. For the first time in 10 quarters, 11 of our top 20 export countries demonstrated year-over-year average daily volume growth, including several key markets in Europe. At the region level, Asia grew average daily volume and revenue in the quarter. And in the Americas region, we continue to see solid signs of the shift in nearshoring. Looking at volume in the second quarter, International total average daily volume was down 2.9% year-over-year, which is half the decline we saw in the first quarter of this year. About three quarters of the decline in the second quarter came from lower domestic average daily volume, which was down 4.4%, primarily driven by Europe.
On the export side, average daily volume declined 1.5% year-over-year. However, on a sequential basis from the first quarter, export average daily volume improved 210 basis points. While overall export average daily volume was down in Europe, in Germany, our largest export market, outbound grew 1%. In Asia, export average daily volume increased 1.7%. And within Asia, export volume on the China to U.S. trade lane increased 20.6%. This is the third consecutive quarter of volume growth on this lane, which is our most profitable lane. And looking at the Americas region, export average daily volume increased 5%, which was the sixth consecutive quarter of growth. As we see the shift in nearshoring continue to take hold, our announced acquisition of Estafeta will further enhance our end-to-end services in Mexico.
In the second quarter, International revenue was $4.4 billion, down 1% from last year, primarily due to the decline in volume. Revenue per piece increased 2.4%, driven by strong base pricing and the positive impact of region and product mix. In the second quarter, total International expense was relatively flat year-over-year. Here, we leverage the agility of our integrated network to manage block hours down 2.1% compared to last year. Operating profit in the International segment was $824 million, down $78 million year-over-year. Operating margin in the second quarter was 18.9%.
Moving to Supply Chain Solutions. In the face of a dynamic market, we remained agile and leaned into areas of growth. In the second quarter, revenue was $3.3 billion, up 2.6% year-over-year. Looking at the key drivers. Within international air freight, strong e-commerce demand, particularly in China outbound, drove an increase in volume and lifted market rates as demand outpaced capacity, resulting in an increase in revenue. On the ocean side, total volume and revenue was down year-over-year. However, toward the end of the quarter, demand on Asia outbound lanes improved and drove market rates higher.
Our truckload brokerage business, known as Coyote, continued to face market pressures, which drove revenue down. And then logistics revenue grew driven by the impact of MNX and healthcare. In the second quarter, Supply Chain Solutions generated operating profit of $243 million, down $93 million year-over-year, reflecting market conditions. Operating margin was 7.3%. Walking through the rest of the income statement, we had $206 million of interest expense. Our other pension income was $67 million. And our effective tax rate for the second quarter was 23.4%.
Now let's turn to cash and capital allocation. Year-to-date, we've generated $5.3 billion in cash from operations and free cash flow of $3.4 billion. We finished the quarter with strong liquidity and no outstanding commercial paper. In May, we successfully issued $2.8 billion of debt to refinance $1.6 billion in current maturities, which will shore up additional liquidity and support our acquisition strategy. And in the quarter, we announced that we would be outsourcing the asset management portion of our pension plan in order to focus squarely on our core business while adding more expertise and oversight that will benefit UPS retirees. Lastly, so far this year, UPS has paid $2.7 billion in dividends, which brings us to our outlook for the second half of 2024.
Global economic growth forecast remained relatively unchanged in the back half of 2024. According to S&P Global, global GDP is expected to grow 2.7% for the full year 2024 and U.S. GDP is expected to grow 2.4%. Additionally, as we've discussed, we still expect the U.S. small package market, excluding Amazon, to grow by less than 1%. Looking at our business in the first half of 2024, revenue was below our expectations and operating profit was at the low end of the range we provided and finished down about 30%. Based on our performance in the first half of the year, combined with our expectation that the product shift we experienced in the U.S. will continue through the rest of 2024, we have updated our guidance. This includes moving to a point estimate because it represents our best view of the many moving parts within our business. We now expect consolidated revenue to be approximately $93 billion, and because the volume characteristics are different from what we originally anticipated, we now expect a consolidated operating margin of approximately 9.4%.
Our guidance includes roughly $1 billion in savings from Fit to Serve. And as Carol mentioned, Coyote revenue and operating profit remains in our guidance and will until the transaction is executed. Looking at the segments. In U.S. Domestic, we anticipate back half 2024 revenue growth of around 5%, driven by strong volume growth. As you update your models for U.S. Domestic, there are a few things to keep in mind. First, we expect average daily volume to grow by mid-single digits. Second, we will anniversary the first year of the Teamsters contract on August 1. Next, product mix is expected to continue to pressure revenue per piece. However, through expense management and slowing labor inflation, we expect to grow third quarter operating profit by double-digit and exit the year with a U.S. operating margin of 10%. And lastly, we expect a strong peak driven by volume growth and demand surcharges.
Within the International segment, our full year and second half outlook remains consistent with what we provided at the beginning of the year. For the second half of 2024, we anticipate volume growth rates will inflect positively and the revenue growth to be in the mid-single digits. Operating margin in the second half of the year in the International segment is anticipated to be approximately 20%. And in Supply Chain Solutions, in the second half of 2024, we expect revenue to be over $7 billion and an operating margin in the high single digit. Included in our guidance is the newly won air cargo business from the USPS, which will be fully onboarded by the end of the third quarter. And lastly, we expect the tax rate to be approximately 22% for the remainder of the year.
Turning to capital allocation. For the full year in 2024, we expect free cash flow to be around $5.8 billion before any pension contribution. We've tightened our capital expenditure forecast and now expect to spend about $4 billion. We plan to pay out around $5.4 billion in dividends, subject to Board approval. And given our strong liquidity, while we originally had not planned to repurchase shares, we now plan to repurchase approximately $500 million of shares this year.
With that, operator, please open the lines for questions.