David Yu is a finance professor at New York University Shanghai who specializes in cross-border financing and aviation finance and leasing. His new book, "Aircraft Valuation and Leasing," is out in October.
Domestic flights are coming back but international carriers need urgent help

Cathay has concentrated on the rare bright spot of cargo activities. © Sipa/AP
David Yu is a finance professor at New York University Shanghai who specializes in cross-border financing and aviation finance and leasing. His new book, "Aircraft Valuation and Leasing," is out in October.