He did have a captive audience:
Pilot reportedly promoted Christianity on flight

But.... these sorts of evangelism by force efforts inevitably backfire. God will provide the opportunity - you have to be there for that open door. Bangin' 'em down only gets people defensive. The best evangelism effort is done in relationship. There isn't really a relationship possible on a four hour flight. (Well, there is, but that's not what I'm talking about!!)