TOGALOCK,

"Current aircraft order is over 500 new narrow body aircraft: 40 in 2022, 138 in 2023 and 350 in 2024"

That was taken directly from APC under the Legacy / UAL section. With those numbers of deliveries it should sustain for awhile (barring oil prices / economy snafus). Your results may vary and no one has a crystal ball.

UFlyer