That is a great idea. As a matter of course, I usually call the FBO and ask them to update the pilots with my show information. This way, if I am at the end of my slide (or later), you can safely finish lunch, etc. I wouldn't like to be sitting "on call" for 1 1/2 hours if the passenger knows he is going to be late. I have gotten many "thank yous" for this call. I jjust did it out of courtesy, but like the energy efficiency issue too (which would also mean lower costs).