If you've ever been wondering why the flights you see (and book) 9-11 months out are changed before your flight, here's a very illuminating interview with Brian Znotis, the VP of Network Planning for American Airlines.   It's part of AA's internal communications effort, but available to everyone through YouTube.   https://youtu.be/yRbhqFJWl8c   In addition, here's the Cranky Flier blog post that was referenced in the video:   https://crankyflier.com/2022/0