If this was a concern other fast-response helicopter services wouldn’t work. As well as the common helicopter air ambulance services used in many countries, hel

If this was a concern other fast-response helicopter services wouldn’t work. As well as the common helicopter air ambulance services used in many countries, helicopters are used on the beaches of Rio de Janeiro to drop lifeguards next to people who’re in trouble in the sea. Given someone in that situation could be dead in 3 minutes it’s clear that getting a helicopter off the ground in time is feasible. (I don’t know for sure but I doubt they have a crew sitting in the helicopter with the engine running 24/7, just waiting for a call.) And as others have noted, the need to transport organs isn’t something that appears out of the blue — there’s at least some lead time available.