regardless, they know you are you, the fingerprints, dob, photo and name don’t lie. I guarantee there is only one of you in the Thai immi system. They rarely mentioned it to me as well but have asked a couple of questions. It’s no issue, but there’s only one @Peter Power, luckily.
you can use 2 or 3 passports but there is only 1 you, they have clearly demonstrated that and discussed the fact with me at Thai immigration. I have 2 passports…..
Air Asia truly suck. Unreliable, no customer service. I booked a 2 leg flight and the shifted the 2nd leg to depart earlier than the 1st one and refused to adjust the 1st flight. They really are just awful….