Show the routes...
747 and other long range planes are a lot of time in the air. and have sense because operating costs. SOme airlines have flights in the midnight to land starting next morning. Using a 20h aircraft is not for worry i do.
look this real "SPAMLINING" of American Airlines in 2000 Atlanta to Dallas: more than 50 flights at week.
if you did 50 weekly flights in AE with those same planes, you would probably not fill demand.
CLT, BOS, JFK, LGA, EWR, ALB, BDL, SYR, HPN, EWN, RDU, PHL, ATL, CVG, MCO, DCA, IAD, BWI, MDW, HOU, DFW, PHX, DEN, BZN, FAT, SAN, LAX, BUR, SBA, SFO, SEA, ANC, KOA, MTJ, MBJ, SXM, CUN, PVR, YVR, SJO, JNB, LLW, LGW
A319, A320, A321, A333, A346, B734, B738, B752, B762, CRJ2, CRJ7, CRJ9, E145, E170, E190, DH8B
AWE, AAL, DAL, UAL, SAA, SWA