When I made my ESTA application half a year ago (so within the 2 years), I flew from Japan. I had to enter the details about my Airline and from where I departed.
I'm going there again (this friday!!!), but flying from another country, and with another airline. I went to the ESTA web site, and checked my old application. It is still valid, and I updated the Hotel and state and city I'd be living in, but there was no way to update airline & country of departure.
Is it still valid?