I looked it up.....it's more complicated than I imagined but it seems it means "heavier than air".....from the old days when they had blimps.
I think that's an A7 Corsair. If so, I saw one in Klamath Falls in about 1985 flying very low....green and brown camo. Cool looking ship....must have been just before they were retired.

Edit:
Doh, I see Marty has an A7 posted above.
Nice pics.


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