You do realize the net effect of AA’s announcement is a massive reduction at ORD - adding just ATH but cancelling MAN, cancelling PVG, and dropping NRT below acceptable levels (on top of cancelling ORD PEK that was previously announced)

The AMS announcement is far larger because it’ll be UA’s 5th gateway flown year round to AMS, a rival fortress hub (SFO IAH ORD IAD EWR)

Compare that to AA to AMS, which is barely PHL year round + DFW seasonal