My airline SupaFly has a fleet of 7 Douglas DC-9-40s in 1978 (along with many A300B4s), and they are leased until 1980 and 1981, which is when I am going to think about replacing them. At that point, would their fuel consumption/maintenance still be economically viable, or would it be better to use a different aircraft? I would either
a) Keep the DC-9s and wait for the A320 in 1988 to replace them
b ) Replace them when their leases expire with their modernized cousin, the MD-8X
c) Keep them until 1984, when I replace them with the 733
d) something else
What do you think I should do?