it is rather unlikely there will be another AA schedule change between now and may. they just did a massive schedule change thru the entire network in the last few days which is rare. i happen to have 7 AA flights booked in may and every single one has been changed in the last few days. for perspective i generally fly about 100 flts annually on AA in the last ten years and maybe see less than 5 schedule changes--so this is rare and unlikely to happen again between now and your flt in may. good luck!