Our paid sick leave amounts may be different, but I suspect sick call rates are very similar between all 3 airlines. Time off is more valuable than money to a lot of people. At AA, dropping trips is currently next to impossible (except for the senior). Their “sick if needed” on reserve option also skews how many sick hours they actually need to burn vs. a Delta pilot.

And for the majority of pilots who only call in sick when they’re actually sick, their usage isn’t going to change based on allotted sick leave.