We really should be talking about Southwest. They have barely cut anything relative to the others, they are now 50% larger than next largest carrier (AA).
Here are the carriers ranked by this week scheduled ASMs and their YOY %
Also understand that in the case of UA, B6 and DL they had a much higher percentage of flights and even proportionately higher ASMs concentrated in NY so UA going from 404 flights to 17 will represent a higher percentage than AA going from 250 to 13. Plus UA would have had flown extensively to Europe. Similar situation for DL in NY compared to AA which is supposedly smaller in Europe than UA or DL.
We all know B6 is a predominately NY based airline hence the similar bigger reduction.
in summary much less to cut for AA compared to UA, B6 and DL as it relates to NY. AA actually has less exposure in this case.