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Busflyer - that controller is doing one more thing - he is reserving you a block of airspace in which you can play. And if someone else wants to play, he gets his own block of airspace.
But on to the point - we know about air guages. So how many use them? We have gas guages, and then deliberately push beyond the warning point. We have speedometers, them drive past the limits. Just how many people would notice a 5 pound drop in oil pressure over 5000 miles if they had a guage? About the same number that notice a 30 pound drop in air pressure over 10000 miles? Hey, it still starts, so battery must still be good.
But on to the point - we know about air guages. So how many use them? We have gas guages, and then deliberately push beyond the warning point. We have speedometers, them drive past the limits. Just how many people would notice a 5 pound drop in oil pressure over 5000 miles if they had a guage? About the same number that notice a 30 pound drop in air pressure over 10000 miles? Hey, it still starts, so battery must still be good.