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I just looked it up. Normally the DNC can pick any VP candidate and run them. IF, however, there is a vacancy in the Whitehouse (if Biden steps down, Kamala does not have an elected VP) THEN Congress does have to approve the VP nominee. So yeah, do NOT let Biden resign the presidency. That would be a disaster.
If you have an international layover, you have to go through customs and then recheck your bags and go through security again. Airlines now (not sure if this is some or all of them, or how long this has been policy) will only let you check your bag within 4 hours of your departing flight. So one time I had an 8 hour layover, where I couldn’t get back into the airport for 4 hours.