Well, someone on the Yahoo! message board suggested a plausible rotation schedule for an aircraft deplyed on the STL-FRA route:
<< Day 1-2 STL-FRA 230p-630A
Day 2 FRA-STL 250p-555p
Day 2-3 STL-LGW 730p-955a
Day 3 LGW-STL 1145A-310p
Day 3 STL-LAX 530p-743p
Day 3-4 LAX-JFK 1000p-608a
Day 4 JFK-STL 820a-1003a
Day 4 wait till 230p for the FRA flight.
Now, assuming that they use the same equipment for all of this ( they could for example easily do a swap in JFK with the inbound TLV or CAI equipment) & assuming my math is right, over 72 hours I get about 16:40 of utilization each day. I would say that's not too bad. >>
(Taken from msg # 59879 by nyc6035 http://messages.yahoo.com/bbs?.mm=FN&action=m&board=7084321&tid=twa&sid=7084321&mid=59879
16.4 hrs of utilization per day on average is actually excellent. TWA may also choose to have some line maintenance and/or deep cleaning done, while the aircraft is sitting in FRA. It's also likely that within a year or two, an additional flight from JFK will be added. The incoming plane from STL may then head back to New York around 10:00am, while the flight arriving from JFK around noon heads back to STL at 2:50. We will see.