Originally Posted by lrdpenn

LGA to where? To any of AA's hubs, no chance. To some Eagle destinations at odd times, it's possible. F does not go out full always, although AA sells those buy-ups really cheap so it's still hit-or-miss. For any non-elite checking a bag it's almost a no-brainer to take the buy-up.

More broadly, flying on AA to/from a UA or DL hub also has decent chances IME, especially late night or early morning.