Sponsorship schemes/Ab-initios

[Burn'em and Turn'em]

Hello everyone!! Just joined the forum a couple of weeks ago and find it to be quite interesting.

Now the question.....do carriers like Singapore, Cathay, Emirates, Thomas Cook, etc (anyone with a sponsorship scheme) accept foeign nationals into the cadet program? I'm a US citizen with a FAA single engine CPL with IR. What are my chances, if any, of getting on with one these carriers?

All posts welcome and thank you.