Tom Bishop says :
According to the Department of Transportation, the average on-time arrival rate is 75% among the 16 largest carriers.
http://www.gadling.com/2011/06/08/airline-industry-best-and-worst-of-april-2011/
"Overall, the airline industry posted an average on-time arrival rate of 75.5 percent. This means that a quarter of the time, they miss the mark. It's almost as easy as being a weather man!"
1 in 4 world-wide flights were delayed. Weather conditions, or a slight misunderstanding of the earth's shape?
Man, you people will believe anything you read if it sounds remotely like a straw to grasp.
About 25% of all flights did not arrive at their destination on time. About 40% of these (10% of all flights) were due to the flight leaving late because the aircraft itself hadn't arrived in time for an on-time departure. Another 30% (7.5% of all flights) are because of air-carrier problems like maintenance issues, late-arriving crews, fueling delays, and the like. 5% (~1% of all flights) are due to severe weather that cause gate or ground holds, diversions, or cancellations. Now we're up to about 74% of the 25% of not-on-time arrivals due to delayed takeoffs, diversions, or outright cancellations, instead of the flight mysteriously taking longer than scheduled.
This leaves only about 6.5% of all flights not arriving on time due to other causes. Of those, the lion's share are National Aviation System delays (another 24% of the 25%; 6% of all flights). Many, but certainly not all, of these result in delayed takeoffs while a problem like traffic congestion elsewhere, often due to weather, is cleared; sometimes the aircraft is required to stay in a holding pattern, keeping it aloft longer than scheduled. If we take a WAG that fully half of the NAS delays extend time in flight, now we're down to a mere 3% of all flights "in the air much longer than expected". Of those, how many just "mysteriously take too long"? Some do, I'm sure, due to routing issues or unexpected headwinds, but some, at least, fall into the "folks, I'm sorry, but we're going to have to circle Chicago for a little while because of a problem on the ground" and, sure enough, there's Chicago, Lake Michigan, the northern midwest, etc. a few miles below you while you're fretting about making your connections.
http://www.rita.dot.gov/bts/help/aviation/html/understanding.html#q4I've flown enough to recognize that nearly all late arrivals are due to late takeoffs. The above rings true.
Tom Bishop apparently just tossed out the fact that "only" 75% of all flights arrive on time (which is true) and let you guys gleefully assume that 25% of all flights are in the air much longer than scheduled. You ate it up and uncritically repeated it here. The next time any of you FE proponents think of accusing the rest of us of "just parroting what you're told", please look in the mirror (or, even better, check your "facts" and what they mean, first). The world (whatever its shape) will be better for it.