Planes fly 24/7. Utilization is part of the reason for all nighters to Deep South.
AA has a handful of day trips to Deep South. Wonderful trips. JFK 1100 to GRU, day off, day flight back arrive 1600(times +/-).
Don't want guys to get the impression that they'll be flying 777's shortly after getting hired. Typical 777 FO is slightly senior to S80 CA(!). QWL. 80-90% of 777 FO's can be CA in their base. For newhires I'd guess 777 will be available in 5 yrs at the earliest(big guess).
The senior, four man (dozing for dollar trips) are flown by guys that could be 767 CA's. Again, QWL.