If these orders can't be fulfilled for the faction it will prevent the
faction from ordering any non-reserve aircraft since transports are
given priority after reserve missions, and they'll never be fulfillable.
As such, no non-reserve aircraft will ever be purchased for factions
without transport aircraft.
Factions without transport aircraft are screwed in other ways, but this
will fix their air planning for campaigns that aren't dependent on
airlift.
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