With airlines actually making money flying full planes with good yields, we've continually seen less and less award space. (onemileatatime.boardingarea.com)
Is it how full the plane is at the time of booking? (doctorofcredit.com)
To my mind the important thing here is the potential each mode has to be green — so let's compare full planes to full trains, if we're trying to help travelers decide which is greener. (treehugger.com)