Are you flying on one ticket? Which airlines?
Yes, it should be one ticket, airline is Emirates. Luggages will be transferred to the final destination.
Are you sure the airline from BKK is Emirates? Did you book direct with Emirates or through an agent. Do you have one PNR (6 digit reference number) for all flights?
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In visa questions you are always better off by trusting tools like https:/…find-visa-requirements.aspx rather than random strangers on the internet. Surprisingly it says that for Maltese passports a visa is required for transit in Thailand, no exceptions.
That makes no sense since during an international transit at Suvarnabhumi you never go through passport control and Maltese passports can even get visa on arrival. However, at check in Emirates staff will just look at the very same information that the tool above provides and will deny boarding when they see "visa required" and you have none.
I suspect "visa required" is a data error but the traveler is responsible for having the correct documents and in this case you have to prove it somehow. If you do not want to fight the system, you need multiple-entry transit visas for Thailand since you presumably fly back the same route in reverse. Alternatively you could try and get from a Thai consular office or embassy an official letter stating that no visa is required for transit. The risk is that the staff won't bother to find out any facts and just respond visa to be required. Or you could write to Emirates and ask them to confirm in writing if a transit visa is required since you do not go through passport control at Suvarnabhumi. Again the customer service might choose to blindly trust the information the already have and respond that a visa is required. A very unfortunate situation but "somebody on TripAdvisor told me so" won't help you at check in.
In case you ever get onto your flights, Emirates web tells that the flight to Siem Reap will be one of the Bangkok Airways ATR turboprops. Those have smaller hand baggage bins than the bigger Airbuses. Make sure that you comply with the dimensions including wheels and handles http://bangkokair.com/baggage-allowance In general the hand baggage rules of the operating carrier always apply and in this case the bin won't even close if the bag is too large.
Thank you for your suggestions :) I have checked with the Royal Thai Consulate of Malta as well as with our Ministry of Foreign Affairs and each reply was different, so I have decided to apply for 2 visas to be on the safe side.
There’s no possible way you will need any kind of visa if you’re travelling on one ticket, one PNR, and your baggage is being checked through to destination. You will be staying airside, clearing a special transit security line, and then going directly to your gate. You won’t be passing through Thai Immigration, which is the only place that might demand a visa.
GSF's reply @ # 6 implies that they will not be allowed to board in Malta by the airline without a visa even if they are in transit. That and conflicting information received from the relevant authorities has lead them to deciding to take out visas to avoid the risk. Seems crazy but ....
Crazy in which way? Their problem is that the Emirates check in staff will look at the information from the IATA database which says that a visa is required when they have none. That of course makes no sense if you know Suvarnabhumi airport procedures but the staff in Malta hardly will personally be familiar with them. What should the staff believe - their employer's computer system or a stranger who insists that TripAdvisor told a visa not to be necessary?
If OP have a letter from the local Thai consulate saying that a transit visa is not necessary they may negotiate themselves onto the plane. If Maltese Ministry of Foreign Affairs writes a visa not to be needed that might convince the local staff although in reality it has no authority to say what are the latest Thai visa requirements.
How would other TripAdvisor members be sure to convince the check in staff that a visa is not necessary when their computer says that it is required? Sure enough to volunteer to refund the OP's holiday if they are not allowed to board the flight? Getting visas is a brute force solution but guaranteed to work and probably a small fraction of the cost of their holiday.