well i was thinking UK-US routes, maybe JFK, PHX. Ive already got
DC7 rotuing BHX - ATL on a .5 frequency
and BFS - ATL on a .5 frequency
my DC8 is curretnly flying
BHX-ORD .5
PMI-ORD .5
I wud imagine that 747's wud equal lower fares for passengers, to gain 100% load on e.g. BHX-JFK seats on a DC8 wud sell at E500, where as on a 747 tickets might sell at E350 to gain 100%
Ive got enough for a either a couple of DC8's (maybe 3 dc8s if i wait a little longer) or one 747 (either -100 or -200 - but for the routes i have in mind either varient would do)
Like MvH said, medium sized a/c would make more money