What kind of retirement plan is offered by BA?
If you work in the USA you will either have to make some good real estate investments or plan on retiring in Guatemala or other country with affordable housing and medical care. You will not be able to stay here and enjoy a decent quality of life with the combination of 401K and whatever is left of social security. In general I think Europe is a better place to retire. In the US we just kick the old people to the street. Many cannot afford their prescription drugs since there are no price controls here like you have in Europe. Drug companies and medical providers can charge a fortune.
I'd stay put. Somehow I think that once you come over here you'll find that the industry is a mess in the states as well.