I was in immigration yesterday. Asked this exact question. Airports are different to land crossings i was told. Fly in as many times as you like! Why would any country on the planet restrict you flying in and out. ??
They insisted at passport control to see my booked flight back home! And lots of questions. Luckily my thai gf was with me! Which helped a immensely during questioning!😂
Ive been here since beginning of jan. Came in on 60 applied for in uk. Extended another 30 days at immigration. 1900 baht. Flew from phuket to KL. overnight trip see a friend. Which achieved another 30 days! 120 days total. Fly back to uk early may! For english summer.
Did it last year for my girlfriend. Came for 6 months. Lots of paperwork. Submitted loads of relationship evidence. Bank statements. Pictures. Quick trip up to tandy building. Biometric scan/ fingerprints. Handed in our 2 inch thick file. 2 weeks later passport returned by courier! Hey presto! Stamped up to go! Best of luck!🤞