Could it be Tain ?

Nope -

https://cimg5.ibsrv.net/gimg/pprune....28b08e99de.jpg
been used for various aviation and other users over the yaers - not just for aircraft

“Avro Lincoln low pass”
gave me the original 3 engines feathered photo.
RAF Defford.

https://cimg7.ibsrv.net/gimg/pprune....ea042c83c.jpeg

Now that's a great picture...................
https://cimg3.ibsrv.net/gimg/pprune....26edda0468.jpg

Tme has passed by and I have ot g o out - Bear is correct - RAF Defford

https://cimg0.ibsrv.net/gimg/pprune....3bbb5bd680.jpg
https://cimg2.ibsrv.net/gimg/pprune....48d0918e47.jpg
https://cimg9.ibsrv.net/gimg/pprune....c273b666a4.jpg

Thanks Asturias!
Now it has been said before: often challenges stay on the same trail. but which trail?

https://cimg8.ibsrv.net/gimg/pprune....38be189dc.jpeg

tropical island airport - Caribbean or Pacific

Could be southern USA - that style of building is VERY common there

Bouganvillea and palm trees seem to indicate Caribbean.
South Caicos?

Caribbean Yes
Caicos no

https://cimg3.ibsrv.net/gimg/pprune....eaa34ba16.jpeg

VC Bird (place name withheld)
We were parked out of shot to the left in 2003; had to hold over Barbuda (seen in the background) waiting for a parking space as in those days there was only enough room for 3 widebodys on the apron.

I presume Chevvron is proposing Antigua - there is a very similar building there near the sea of the runaway - some Flight Scholl? But the building doesn't look like the challenge to me

Chevvron has it with VC Bird international airport on Antigua. Still only 4 spots on the terminal but a large apron.
The South USA style building is again a Signature private flight base.

Chevvron you have control.

We had a villa in a marina on the south west coast where the water was right outside our patio/mooring. We used to throw bread to the fish swimming just below the surface, then pelicans would dive in right in front of us and eat the fish!!
Open house!!

This airfield isn't particularly historic, or at least its history doesn't go back a long way. The neck of the woods it serves, however, is another story.
https://cimg7.ibsrv.net/gimg/pprune....9b9f4e8d68.jpg

Kazakhstan?

yes Samarkand or Tashkent came to mind but it's neither of those

Sydney has external spiral stairs but its not there either

No giant mountains near Sydney either. ;)

China....?

Nobody's in the right continent yet!