Sponsorship
The company i work for flies USPS, UPS contracts. The company tried on several occasion to sponson abroad pilots..however, TSA has not been too kind to this. Since 911 there has been lots of or rules governing this and finally my company got fed up and stopped the process that they were doing for thisone particular pilot.
Even if this pilots was allowed a visa to work here from the sponsor, the USPS, UPS requires that the pilot be a resident of the US for at least 5 years. Sorry to say we did lose a good pilot over this and prevented another to be sponsered.
I cant speak for the other companies but TSA has the final word..it seems like..
Good Luck..