When you apply via Sydney online pre-approval write flights and dates to suit the 60 days or less. They do not ask for proof of the flights

@Jody ******

If someone says not required and they go without it and the IO on the day asks for it then you have wasted a day hence why I suggested taking it just incase

You need passport, TM30 from where your staying (some Immigration dont ask for TM30 but take to be safe) copy of arrival page stamp copy of data page 1900baht cash. TM7 form available there to complete can be found online but again some prefer their own form completed, I downloaded for extension few years ago and Bangkok wanted theirs so sat at the IO desk and did their form. There is an office to do coping there if you can not do elsewhere.

@Jack ***************

Airside means your staying on the international side of immigration and customs. When you transit say throught Singapore like I do every 2 weeks I stay international airside and just go to my gate for next flight to Thailand. Same when I was flying perth bkk to Phuket stayed international side in bkk and got my arrival stamp in Phuket from immigration

@Richard ********

my arrival and departure stamps always phuket yet I transit through bkk Maybe its just a continuous international flight not switching to a domestic

@Richard ********

I live here and fly international every 2 weeks so 10 years doesn't mean nothing to me

@Richard ********

Airside in transit is not entering the country

@Richard ********

I have flown perth bkk to phuket and always done immigration and customs in phuket

@Jack ***************

free to wander airside not the whole airport. You will be in transit if you did customs and immigration in CR

@Richard ********

If you stay airside you don't enter at the first stop in Thailand