Ed Bastian
Chief Executive Officer at Delta Air Lines
Well, thank you, Julie, and good morning, everyone. We appreciate you joining us.
Before we start, I want to acknowledge the unfolding war in Israel and the tragic loss of life that has ensued. Delta is donating $1 million to the American Red Cross for the International Committee of the Red Cross to help fund humanitarian efforts in the conflict. This includes emergency assistance such as health services, emergency care, ambulance services, and other critical needs. Our inbound and outbound flights to Tel Aviv have been suspended through October 31 to ensure the safety and security of our customers and employees. We are also offering a customer waiver for travel to Tel Aviv for those who need to change their travel plans. Our hearts with everyone impacted by these tragic and horrific events.
Turning to our news for the day. This morning, Delta reported September quarter results, posting earnings of $2.03 per share, a 35% increase over last year. Revenue grew 13% and we achieved a 13.5% operating margin. This resulted in operating income of $2 billion, bringing our operating profit over the last 12 months to over $6 billion. The Delta people delivered for our customers throughout the very busy summer season, and I'm grateful to our teams for all they do for our customers and each other every day. Our people are the foundation of Delta and are our most important competitive strength.
Sharing our financial success with our people is a long-standing pillar of Delta's culture. With this quarter's financial performance, we accrued another $420 million towards next February's profit sharing. This brings our profit-sharing accrual to over $1 billion year to date, marking an important and exciting milestone for the Delta team. The great work of our 100,000 people was recently recognized as Delta ranked Number 12 overall on TIME Magazine's list of the World's Best Companies. We were the only airline to make the top 100 of this prestigious list. And USA Today readers just selected Delta as the Best Airline in the world.
Our operational fundamentals remain strong, underscored by Delta's industry-leading position in on-time arrivals and blue sky operational performance that is reliably back to pre-COVID levels. Following a high number of irregular operations days early in the quarter driven by weather and ATC constraints, we have seen consistent improvement in our operating metrics. In October, we are running a near-perfect completion factor across the mainline system, and we remain number one in on-time arrivals year to date.
As we're now in the final phase of our recovery, we are making important forward leaning investments in the health and reliability of our fleet. These maintenance investments will position us to consistently deliver the operational excellence that underpins Delta's brand. Running a high-quality operation is critical to being the airline of choice for our customers and driving a competitive cost structure. Dan will speak more to this shortly.
During the quarter, we also made a $150 million strategic investment in Wheels Up, co-investing alongside Certares Management, Knighthead Capital and others. This new investment structure combines the number one premium commercial airline with the travel and tourism expertise of Certares and the turnaround expertise of Knighthead. Delta's relationship with Wheels Up creates a new premium product line for our customers, and I look forward to working with our co investors and the new management team to unlock the full value of this uniquely positioned business.
Turning to our outlook, travel remains a top purchase priority and our core customer base is in a healthy financial position. We continue to see strength in bookings across Delta's global network, driven by our consumers. Demand for premium experiences, international travel and increasing business travel further differentiate the trends that Delta is seeing within the industry. We expect our December quarter revenues to be 10% higher than 2022, with a 10% operating margin and earnings of over $1 per share. This brings our expectation for full year earnings to over $6 per share on a double-digit operating margin and free cash flow of $2 billion.
Since raising full year guidance over the summer, our revenue outlook has improved, though earnings and cash flow have been impacted by higher fuel and maintenance costs. Revenue for the full year is expected to increase 20% over last year, which was the high end of our expectations on steady domestic demand and continued strength in international. With strong top-line growth and margin expansion, we expect to double earnings year over year and deliver a 13% return on invested capital. Our outlook for 2023 keeps revenue, earnings, cash flow and debt reduction on track with our three-year plan which we issued in December of '21.
As we progressed through the recovery, we have made meaningful investments in operational reliability and our people. Delta has led the industry in setting the bar for wages, including a new pilot deal and profit sharing. We are seeing the structural step-up in operating costs amid increasing fuel prices, creating some near-term pressure on industry margins. However, I fully expect that the market will adjust to higher costs as it has historically and reestablish equilibrium. With Delta's differentiated premium revenue strategy and strong global network, we will continue to deliver industry leading profitability and generate robust free cash flow.
In closing, the strategy that we shared at Investor Day positions us well for the future. And while the operate -- the environment we operate in continues to evolve in this post-COVID world, our objectives are unchanged as we move into 2024. With our network rebuilt and growth now moderating, optimizing the airline and driving efficiency are significant opportunities.
Thank you again for your support of our company. And with that, let me hand it over to Glen and to Dan to go through the details of the quarter.