I work inflight rostering at UAL and we have been getting slammed hard with FAs going ONSL (on sicklist).
I took 10 once in a 5 min period. Over Christmas system wide they said there were over 1800-2000 FAs ONSL. Our standbys are nonexistant - for as soon as they checkin they go out. Plus, at UA, ORD covers everyone else's shortstaffing, so we are always deadheading crew to LAX/SFO/DEN/IAD to cover their flights.
Right now, most narrowbodies are going out only with FAA minimums on board - enhanced/max staffing is out the window right now. Until the ONSLs decline, 6 on a full B757 flight is nonexistant.