American Airlines still has fewer mainline aircraft flying than they did before the pandemic. They retired their Boeing 757s, 767s, Airbus A330s (that they’ve even still been paying on) and Embraer 190s during the pandemic. And they’ve kept Boeing 737s parked in the desert.
However they’re bringing back some of those 737s this year, and will take delivery of 19 new narrowbody and 4 widebody aircraft in 2023. All told they expect to end 2023 with more active mainline aircraft than their average for 2019, but still fewer aircraft total.