It should be no surprise you screw the Pilots and they will screw you back.....
Pretty much any Pilot can ground any plane at anytime no MX is perfect and judging from all the recent FAA fines AMR's Suck's...
A Pilot in the normal course of their job keep the operation running on time. If they do Their job and only Their job the operation does not run as smooth as it normally should...
I guess AMR's Suck AA$$ management is now getting what they pay for...
Oh well, I hope their bonus money doesn't get blazed..