I was looking at the online application of an airline is Asia yesterday. I am planning on applying there in the next year. (I just need to get to 1000 hrs of jet time first) I saw on the application that they wanted my social security number. I have worked overseas before, and the last foreign company I worked for did not ask or require my U.S social security number. Should I just leave that information out? I am not sure what a foreign company with a base outside the US would need my social security number for.