I’m looking at visiting Thailand in January for a month in Issan then crossing the border into Laos for a month, returning to Thailand and heading South for the 3rd Month. I will have a London-Bangkok return ticket. Will that ticket be accepted by the airline on arrival?

Hi - I'm due to book a flight to Thailand for 75 days - I understand that a tourist visa will give 60 days and that I can extend at immigration for another 30 days - will having a 60 day tourist visa be acceptable at passport control in Bangkok or will I have to book another flight to say Cambodia before 60 days are up - Thank you

Appreciate some knowledge here. I bought a one way flight from the UK to BKK with Emirates and plan to get a 6 month multi entry visa. I am then going to book an onward ticket to KL for probably about 10-11 weeks after I land. So, I will claim the multi entry visa gives me 2 months, then will get 30 day extension at Promenada Mall in Chiang Mai, then will go to KL. Question is will Emirates care that my onward travel is almost three months later? In UK, airline ground staff may not understand nuance. Or is this all fine and I’m sweating the small (again). Thanks all..