Dual Nationality. What passport do i use?

[Steps]

I have just got my children their British passport and we are due to fly out in November to the UK. I would like to know if anybody has experience with exiting and entering Thailand and the UK with both a Thai passport and British passport.

For example, on the airlines website, they ask for the passport details of my children. What details should i enter?

I am assuming that they would go through immigration in Thailand with their Thai passport and enter the UK with their UK passport and visa-versa.

Would the airline or immigration not ask about the absence of a visa in the Thai passport?

Thank you

[bobrussell]

Present both at check in at each end. Present UK passports at Border Control in the UK. On return enter Thailand at immigration with the Thai passports to avoid the time limits etc on their stay.

Airline check in just need to know that there are no visa restrictions especially on the flight to the UK. UK passport holders do not require a visa to enter the UK.

(did not read the post carefully enough!)

[skatewash]

The answers to your questions can be found here, I recommend reading it: http://www.stylehiclub.com/cruising-flying/step-step-guide-to-traveling-with-two-passports/

To answer your specific questions:

For example, on the airlines website, they ask for the passport details of my children. What details should i enter?

They are going to the UK, so you should enter the details from their UK passports.

I am assuming that they would go through immigration in Thailand with their Thai passport and enter the UK with their UK passport and visa-versa.

Yes, again the process is very well described in the link referenced above. They leave and enter Thailand using their Thai passports. The enter and leave UK with their UK passports. It is also important that you check-in using the correct passport.

Would the airline or immigration not ask about the absence of a visa in the Thai passport?

This is answered in the link. Generally, immigration is concerned with your right to enter the country, and that your passport is in proper order to leave the country. The fact that you are entering the country using a passport from that country establishes your right to enter that country (that is, citizens can enter their own country without a visa). The fact that you leave the country using the same passport you used to enter the country ensures that your passport is in proper order: exit and entry stamps are present in the same passport. That takes care of immigration. You only need show immigration the passport from the country you are currently in.

The airline is generally only concerned that you will be allowed to enter the country you are going to. Therefore, it is usually necessary only to show them the passport of the country you are going to. If, and only if, questions are raised should you show your other passport if doing so would help resolve the question.

[Steps]

Thanks for the link. This is exactly what i was looking for

The answers to your questions can be found here, I recommend reading it: http://www.stylehiclub.com/cruising-flying/step-step-guide-to-traveling-with-two-passports/

To answer your specific questions:

For example, on the airlines website, they ask for the passport details of my children. What details should i enter?

They are going to the UK, so you should enter the details from their UK passports.

I am assuming that they would go through immigration in Thailand with their Thai passport and enter the UK with their UK passport and visa-versa.

Yes, again the process is very well described in the link referenced above. They leave and enter Thailand using their Thai passports. The enter and leave UK with their UK passports. It is also important that you check-in using the correct passport.

Would the airline or immigration not ask about the absence of a visa in the Thai passport?

This is answered in the link. Generally, immigration is concerned with your right to enter the country, and that your passport is in proper order to leave the country. The fact that you are entering the country using a passport from that country establishes your right to enter that country (that is, citizens can enter their own country without a visa). The fact that you leave the country using the same passport you used to enter the country ensures that your passport is in proper order: exit and entry stamps are present in the same passport. That takes care of immigration. You only need show immigration the passport from the country you are currently in.

The airline is generally only concerned that you will be allowed to enter the country you are going to. Therefore, it is usually necessary only to show them the passport of the country you are going to. If, and only if, questions are raised should you show your other passport if doing so would help resolve the question.