Originally Posted by
abhilife2001
Correct.. immigration does not care which airline u fly.. they only want to ensure that you have a return ticket within the maximum period of ur allowed stay in that country..
In the OP's case, the query is whether the airline will have a problem with a nested ticket..OP is not breaking the immigration rules or overstaying so for immigration purposes even if he shows BA return ticket, its fine..
I do not think the above is true. The moment you check-in, your return date is flagged on the screen and the terminal operators are trained to ensure passengers passport or visa is validated against those (irrespective of whether its london or BKK)
If you are checking in with a Thai passport, they probably do not care.
And the fact that there isnt a great influx of brits migrating into Thailand in view of overstaying, this is probably one area the airlines and immigration officials (at BKK) might keep a blind-eye.
Even if you wave your BA ticket from BKK at the counter, thats is not good enough - it is just piece of a paper. Your entry is still controlled at the port by a ticket and passport, as long as your not a citizen where you are standing.