Since 1987 we have helped travelers do complex international trips, around the world trip or round trips to Nepal to Trek. Below is our 17 "Tier One" cities. i.e. large cities that have many many routes to get going on a complex trip. Perhaps this is a better way to explore starting your exploration around what is possible?

USA
New York
San Francisco
Los Angeles
Chicago

Europe Main Hubs
London
Amsterdam
Frankfurt
Paris

Asia Hubs
Bangkok
Tokyo
Singapore
Hong Kong

Middle East Hubs
Dubai
Doha
Instanbul

Latin America
Sao Paulo
Mexico City