Hoping a travel agent or someone with customs experience might be able to help.
I want to travel to Thailand but my son's passport has less than 6 months validity on it. However he has a second passport with a few years left (both are visa exempt for Thailand).
My thinking is:
1. He has to leave his home country on that passport as is required. Customs here won't prevent him from leaving because he will leave and enter on a valid passport.
2. The airline is responsible for boarding. If they say he can't travel on the first passport, I can show them the second and say he will enter Thailand on that as it has more than 6 months validity.
Is this correct? It is the airlines who are responsible for checking that passengers meet the destination requirements, isn't it? Customs in your own country will really only check that you leave or enter on a valid passport, won't they?