For three passengers what is the cost for transit from gate to gate for roundtrip? We have a 1 hour connection and will require a electric cart. 
ORD-IST TK6 21:40-16:10 April 27
IST-NAP TK1453 15:10-18:25 April 28

VEN-IST TK1868 09:30-13:05 May 9
IST-ORD TK5 14:15-17:40