F-15C Eagle in scenario mode:
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Successfully finish sub-mission 5 in area 4.
Unlock F/A-18 Hornet:
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Use in the scenario mode, win sub-mission seven in area two and it will
be added to
your stock of playable fighters.
Unlock F-16C:
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Win sub-mission 4 in area 2.
Unlock Mig-29G:
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Win Sub-mission 10 in Area 4