Ken Giacobbe
Executive Vice President and Chief Financial Officer at Howmet Aerospace
Thank you, John, and good morning, everyone. Let's move to slide five for an overview of the markets. All markets continued to be healthy in the first quarter. On a year-over-year basis, performance was as follows. Total revenue was up 14%, driven by very strong growth in the commercial aerospace market, which was up 23%. Commercial aerospace has now grown for 12 consecutive quarters and represents approximately 50% of total revenue. Growth continues to be robust supported by demand for new more fuel-efficient aircraft with reduced carbon emissions and increased spares demand for engines.
Moving to our other markets. First, defense aerospace was also strong, up 12%, driven by fighter programs and engine spares demand. Next is commercial transportation, which has been resilient in a challenging market. Revenue was up slightly as we continue to offset weakness in the market by taking share from steel wheels with Howmet's lighter and more fuel-efficient aluminum wheels. Finally, the industrial and other markets were up 7%, driven by oil and gas up 15%, general industrial up 10%, and IGT, which was flat. In summary, another strong quarter across all of our end markets.
Now let's move to slide six. First, moving to the P&L. Q1 revenue, EBITDA, EBITDA margin and earnings per share were all records and exceeded the high end of guidance. Revenue was up 14% and EBITDA outpaced revenue growth by being up 21%, while absorbing the addition of approximately 430 net new employees in the quarter. Incremental flow-through of revenue to EBITDA was a healthy 35%. EBITDA margin was a record at 24% and earnings per share was also a record at $0.57 which was an increase of 36% year-over-year.
Now let's move to the balance sheet and cover the balance sheet and cash flow. The balance sheet and liquidity have never been stronger. Cash at the end of the quarter was $534 million, and free cash flow was a record for Q1 at $95 million. Net debt to EBITDA improved to a record low of two times. All long-term debt is unsecured and at fixed rates, which provides stability of interest rate expense into the future. Howmet's improved financial leverage and strong cash generation were reflected in Moody's Q1 ratings upgrade to investment grade. With this upgrade, we are now rated as investment grade with all three rating agencies. Additionally, with the recent upgrades, we have established a $1 billion commercial paper program, which further strengthens our liquidity.
Finally, we continue to have access to our $1 billion undrawn revolver. Total liquidity now stands at approximately $2.5 billion. Finally, let's move to capital deployment. We deployed approximately 700 -- excuse me, $170 million of cash in the quarter to shareholders, of which $150 million was used to repurchase common stock. This was the 12th consecutive quarter of common stock repurchases. The average diluted share count improved to a record low Q1 exit rate of 411 million shares. Finally, we continue to be confident in our free cash flow. In the first quarter, we deployed approximately $20 million for the quarterly common stock dividend of $0.05 per share.
Now let's move to slide seven to cover the segment results for the first quarter. Engine Products continued its strong performance. Revenue increased 11% in the quarter to $885 million. Commercial aerospace was up 14%. And defense aerospace was up 13%. Both markets realized higher build rates and spares growth. Oil and gas was up 15% and IGT was flat. Demand continues to be strong across all of our engines markets. EBITDA increased 17% year-over-year to a record $249 million. EBITDA margin increased 140 basis points year-over-year to a record 28.1%, while absorbing approximately 435 net new employees in the quarter. Once again, the engines team delivered another strong quarter.
Now let's move to slide eight. Fastening Systems also had a strong quarter. Revenue increased 25% year-over-year to $389 million. Commercial aerospace was up 44%, including the impact of the widebody recovery. Commercial Transportation was up 5%; general industrial was up 14% and defense aerospace was down 11%. Year-over-year EBITDA outpaced revenue growth with an increase of 59% to $92 million. EBITDA margin increased 510 basis points year-over-year to 23.7%, which reflects the improved commercial and operational performance, complemented by the widebody recovery.
Now, let's move to slide nine. Engineered Structures performance continued to improve. Revenue increased 27% year-over-year to $262 million. Commercial aerospace was up 26%, driven by build rates and the widebody recovery. Defense aerospace was up 27% year-over-year, primarily driven by the F-35 program. EBITDA was up $7 million year-over-year and EBITDA margin decreased slightly to 14.1%. Sequentially, revenue, EBITDA and EBITDA margin increased for the third consecutive quarter. The team is making progress, and we expect continued improvements throughout 2024.
Finally, let's move to slide 10. Forged Wheels revenue was essentially flat year-over-year in a challenging market. Although revenue was essentially flat, EBITDA increased 4%, driven by volume and productivity. EBITDA margin was a healthy 28.5%.
With that, now let me turn it back over to John.