Slitherine

I am working on an airborne scenario using some 'regular' unit types (eng, AT, art) in air transport simulating para support units.
I have placed an unsupplied airfield in each of the landing zones.
I've got a trigger that changes the hex owner when the air transport is in the airfield hex.

This works for for British units, but not US...
I have tried using Team and Alliance as Unit Owner, but it seems that it is the US unit itself that is the problem. BTW, no US unit type works.
I have attached a small test scenario. Start a multiplayer hotseat and move the UK and US airborne engineer units straight up to each German airfield.

Got the same when trying it with US and UK in one (first) human faction, no other changes.

But I do get both hexes to change ownerships when I make sure it refers to the Skytrain TP as "check" unit, and derived from the US unit list.

So Brit trigger > skytrain from Brit roster, US trigger > from US roster. Could it be you have the UK one in both?

edit: hmmm, looking again -- visually the second one seems US indeed. However, it worked for me when I just linked it again to the US one.

Thank you, Bernd. Excellent detective work.

This subtle difference may actually work to a designer's advantage.
In my case it will prevent US para support units from 'hi-jacking' a British landing zone.