Most airlines assign flight numbers randomly, but every so often, a bit of whimsy makes its way into the schedule.
Southwest Airlines Flight 711 goes from San Antonio to Las Vegas in a wink to the craps tables, an airline spokeswoman said. Some flights to and from Philadelphia fly under 1776, the year the Declaration of Independence was signed in the City of Brotherly Love. And some flights to Columbus, Ohio, go by 1492, the year Italian explorer Christopher Columbus sailed the ocean blue.
“At Southwest, we try to have fun with everything we do,” the spokeswoman said. “We have a system built in-house that allows us to include or exclude flight numbers as we see fit, but we do assign certain numbers to certain flights for fun.”
The occasional “legacy number” remains, such as American Airlines' Flight 1 from New York’s JFK airport to LAX, but “most of the stuff is pretty random,” he said.
“They used to have more fun with these things in the past,” Snyder said. “They try to keep with legacy systems when they can, but the airline mergers have thrown them into disarray. Every airline used to have a flight 1, but when you have a merger, which one do you keep?”
United Airlines pulled the merger card Wednesday when flight numbers 93 and 175 resurfaced briefly, despite having been retired after the September 11, 2001, attacks on New York and Washington.
A technical glitch occurred Monday, when a computer assigned those numbers to existing Continental Airlines flights, United spokesman Rahsaan Johnson said. United and Continental are the process of merging, and flights carry both United and Continental numbers, he said.
"It should not have happened, and we should have caught the mistake sooner than we did," Johnson said. The numbers will remain off the books, he said.
Like United, many airlines have a list of flight numbers they don’t use, usually because of their association with disasters, Snyder said.
Southwest probably has the most latitude, he said, because it doesn’t code share its flights with other airlines.
Even so, he said, the art of numbering flights appears to be going the way of the Concorde (which, by the way, was British Airways Flight 1, from London's Heathrow airport to JFK).
“It adds a nice little human touch when you get some of those flight numbers. Certain frequent fliers get nostalgic if they fly a lot on the same flight number. There’s something about it people tend to identify with,” he said.
“It’s a goofy nostalgia thing that doesn’t matter, but it’s an intangible.”