This is a current situation we're trying to find solutions for.
My 17yo son has been in Florida for a week with friends, and is about to come home (flying to San Diego). Luckily the flight today has been delayed (well, was canceled and rebooked for tomorrow night) as he has realised his bag, containing his only IDs (NZ passport and a SENTRI card) were left in the car that dropped them at the airport. They have so far been unable to reach the driver of the car.
What options does my son have, if any, to fly without his ID if they can't reach the driver? He has travel insurance. Everyone else he is flying with are US citizens, however my son is not a US citizen (is in US on B2 visa). I have a scanned copy of the ID page of his NZ passport (but not of his US visa), and a scanned copy of his Mexico Residency ID card - if I send him those to display on his phone would/could that help? Or is he stuck and we have to make some other travel arrangements?