The British air travel intelligence service was founded in 1929 when passenger aircraft were just emerging. OAG recently rated the US airlines with the most frequent unflier records.

At the top of the list and bottom of on-time records are United, Southwest and American. According to the OAG report, Delta and Hawaiian Airlines are the most reliable.

Of course, as any experienced senior frequent flier will tell you, it’s all based on random luck. On any given day of crowded skies the list can be reversed. Bad weather, mechanical troubles, jammed runways, passengers being dragged off and many other factors can cause delays.