According to the Center for Aviation, weekly flight frequencies between Mumbai and Delhi have increased 383% since 1995.

BBC: The new epicentre of business travel

Since leaving the Board, I have worked as an independent aviation safety consultant, currently teach as an adjunct at Vaughn College of Aeronautics and Technology in New York and write numerous monthly or bi-weekly columns for aviation trade publications.

FORBES: PlaneWorks: A New Aviation Blog by John Goglia

For more than a decade he has worked as aviation editor at Jane's Defence Weekly, the respected (if mind-numbingly technical) trade journal for the defense industry.

FORBES: Magazine Article

Air traffic control personnel "would have known immediately" of a crisis when the planes veered away from their normal route, according to Chris Yates, aviation security editor of Jane's Defence Weekly.

BBC: Cockpit drama of doomed planes