A double-amputee Marine veteran with prosthetic legs was dealt a humiliating “blow” when a Delta flight crew forced him to move from an exit row seat – despite being built like a linebacker and serving as a Long Island cop, a new lawsuit claims.

Suffolk County cop Matias Ferreira, 36, was on a plane ready for takeoff at JFK Airport on May 17 – but Delta staff allegedly told him he couldn’t stay in the exit row, which is reserved for fliers who could need to jump into action in the event of an emergency, according to the lawsuit filed Monday.

“I don’t want the kids that I’ve worked with in a capacity that have prosthetics to ever feel like that they can’t do something because somebody said ‘hey you’re a liability’ and that’s essentially what I felt like that day,” he told The Post.

“I fe

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