For large planes like you have I will most likely do something similar, this is why I said my strategy above is only for turbo props and jets for nowMy strategy is different than most posted here. This game requires patience or money. I use patience. I fly 5 of the same type to the Excavation destinations until they are 3 starred. I don't speed them up, just send them back out again when they land. I then activate the maps and send those 5 planes to the map destinations, using fuel catalyst to speed them up if needed so I get at least 10 flights per map. For the falcons I am getting 15-17 flights per map (I have 2 s3's). It takes longer but uses less resources.
Definitely fly the Excavation destinations with the maps from Duke before selling off your planes, It's like any other destination for 3 stars. You can always tackle the timed maps later.