Hey there, I booked a flight for a nephew (19 years old) a flight to ATH w stops in MSP and CDG along the way via Delta + Air France in Z the whole way. Will he need to go through immigration in CDG? If so, is 90 min enough for a lost teenager to find his way to the gate? He's not retarded, but will be out of his element and on zero sleep when landing in CDG. Any advice we could give him would be very much appreciated. This will be his first international flight and he will be travelling solo. Do the airlines have a concierge service for someone in his position to help him navigate the airport? THANKS in advance!

This is his itinerary. THANKS GUYS!!!