1) Have they gone enmass on casual leave in the US?
2) Are they asking for pay hikes in the current market scenario?
A decade ago, American Airlines pilots represented by the Allied Pilots Association staged a massive 'sickout'. Judge Joe Kendall approved a temporary restraining order against the job action, which most of the pilots ignored. As a result, APA got taken to the woodshed and a $45.5 million fine was levied and the fine was upheld on appeal. I'm sure it was wrapped into a later concession package, I doubt much of it was actually paid. It was the heady days before 9-11 when AA pilots were making top dollar.
After the massive fine, I don't believe pilot sickouts have been in the vogue in the U.S.
Don't know if they've had a recent reality check but a couple of years ago the APA was asking for a 53% pay increase:
American Pilots Seek 53 Percent Pay Hike - Business News - redOrbit