when I was flying Austria-Thailand with Eva Air.. I was unlucky, the passangers of tourist class could not choose the meal, only the business class
No, I was wrong. Even in the tourist class it was possible. However, only with help of agency.
I mixed it up... after I had bought the ticket, when I logged in the internet site of EvaAir, I could do check-in and some other things but I was not able to change the diet (only the VIP, business etc. classes could do it this way). Then I just emailed the agency and they managed it easily, we had the meal we wanted.
Have a nice time in Thailand.