Laptop, passport and credit cards. Never hurts having a few dollars and Euros in cash around too, might wanna buy something at some strange airport and for some reason they wont take cards.
Change of clothes is a must! Need to get by 48 hours without my luggage, in case it is lost. Or on transatlantic flights, it's always so nice to go to the lounge or airport hotel and have a shower after a long flight. Then it's just a city hopper in Europe or the US and you arrive fresh, har dto beat that!
Airport hotels (located inside the security area) or rental shower-rooms are available at for example Detroit airport, Amsterdam Shiphol, JFK and Minneapolis/ST Paul.
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