Posting for a friend: He is currently with company A (valid h1B till mid of 2019) and has accepted offer from company B to join them in two months from now. Company B had initiated his h1B transfer and it got approved (he hasn't receivedthe new i797 from company B) . Due to personal emergency he needs to travel outside of the country next week. Question: is it safe to travel outside the country with his current visa stamp and i797 from employer A which is valid till mid 2019 ? He is not quitting until his return . (He didn't receive the i797 from company B or any documents from company B)
It can be risky but know many people who have done that. But it’s risky. Don’t mind how come it’s an emergency and he will still wait for 1 week to get on a flight 😊
i suspect that if he enters with old 797 then the new one will become invalid...better check with lawyers
They should be able to reenter. However I'd contact the new company's immigration attorneys just to be sure.