Collecting Aerograms/Air Letters

I recently bought a lot of stamps. In the lot was an bunch of air letter stamps that had been cut from the actual letter. The "stamp" has plenty of writing, yet it is simply the stamp portion of the whole letter.

Are these worth anything or would collectors only want the whole envelope?

Is there any market for these simple "stamps" only?

Thanks to anyone who responds!

In general, we look for the complete item. I've some, circulated British airletters. As for the "stamp", it doesn't interest me. But... who knows... some people might think otherwise...

What you call 'simple stamps,' generally, are called cut-squares or cut-outs by collectors. These used to be popular, but no longer are. Of course, there always will be some collectors. Being from air letters, they will be modern. That makes them even more fringe items.
I doubt there will be any value in them, except for the very rare ones and to such a specialised collector who has not yet got them. Maybe an aerophilately society can tell you more.

Thanks to Cursus and NSK. Most helpful!

It's good to have the insight and the technical name of these things.

I'll hang on to them just because. It's not like they take up a lot of room.

Here is a new angle. How about the same concept regarding cut outs, but from envelopes. Not specifically air related, but a regular everyday envelope that a postal service printed/embossed with the postage? I think it will be the same answer, but I had to ask.

Thanks again!