A twin seater is planned for the Su-57. A twin seater conversion trainer was planned for the F-22 but that was cancelled when the total F-22 order was greatly reduced. A highly modified F-22 twin seater optimized for long range interdiction was proposed but not adopted.
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AFAIK no twin seat F-35 is seriously proposed.
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AFAIK no twin seat F-35 is seriously proposed.