Thailand a hub for other countries investing, they make most of the money...
Thailand merely rakes off some tax revenue?
does Thailand have anything of it's own?
[apart from the oldest profession]
Aircraft need a nose wind when landing or taking off... switching the direction is normal practice even on a daily basis depending on wind direction.
A seasonal change is not unheard of.
Tailwinds make things a lot more iffy for the flight crew.