What’s the world’s oldest airport? Why is there an “X” in PDX? Is there a way to get a nap between flights? And what happens to the change you leave in airport security bins?

Airports are big, crowded, and full of questions. The following eight facts might change the way you catch your next flight — or at least end some mysteries.

Original photo by Michael Rosebrock/ Alamy Stock Photo

In Airport Codes, “X” Is Just Filler

The LAX-Sign at the Entrance of the Los Angeles International Airport. — Credit: Michael Rosebrock/ Alamy Stock Photo

The “X” and the end of “PHX” makes sense for Phoenix Sky Harbor International Airport — but what about “LAX” for Los Angeles and “PDX” for Portland?

Turns out, the “X” is left over from the days when airports used two-letter codes from the National Weather Service. With the rapid growth of air travel, it soon became apparent that two letters wouldn’t be enough. When International Air Transport Association (IATA) three-letter codes became the norm in the 1930s, some airports gained an “X” at the end.

Then there’s Sioux City Gateway Airport, which is blessed with the IATA code “SUX.” In 1988 and 2002, officials petitioned to change the code, and were offered five options by the FAA: GWU, GYO, GYT, SGV, and GAY. They opted to embrace what they already had instead, and introduced a line of merchandise — beanies, mugs, and more — emblazoned with the “SUX” logo.

The Wright Brothers’ Airport Is the World’s Oldest Continuously Operating Airport

A plane takes off from College Park Airport in Maryland. — Credit: The Washington Post via Getty Images

Flight pioneer Wilbur Wright established College Park Airport in College Park, Maryland, in 1909 as a training ground for two military officers as they got ready to fly the government’s first airplane. More than a century later, it’s still a public airport, making it the oldest continuously operating airport in the world.

There’s a little bit of an asterisk on that record, though, in that you can’t really catch a flight there — unless you have or know somebody with an aircraft and a pilot’s license. Which brings us to…

Hamburg Airport Is the Oldest Continuously Operating Commercial Airport

An airbus of the airline Eurowings takes off from Hamburg Airport. — Credit: picture alliance via Getty Images

If you’re looking for the oldest airport with terminals and plane tickets, look no further than Hamburg Airport, established in 1911. But while America was building its aviation history on airplanes, Germany built the facility around the country’s own technology: Zeppelins.

Count Ferdinand von Zeppelin, the inventor of the Zeppelin airship in the 1890s, gave an enthusiastic speech about the future of air travel in Hamburg in 1910. Residents believed in his vision, and the first building at the Hamburg Airport was an airship hangar, built in 1912. However, it took less than a decade for airplanes to start taking over. The airport broke the one-million passenger mark in 1961.

Airlines Pay Up to Eight Figures for Slots on the Airport’s Schedule

Close-up of an airport arrivals and departures sign. — Credit: JESHOOTS/ Unsplash

To keep air traffic running smoothly and safely in more than 200 of the world’s busiest airports, airport operators grant airlines slots that give them authorization to take off or land at certain times — and in many places, demand is far outpacing supply.

The most expensive slots are at Heathrow International Airport in London, England. In 2016, Kenya Airways sold its only slot to Oman Air for a whopping $75 million. That’s on the high side, but eight figures is relatively common. One year later, two slots fetched the same price when Scandinavian Airlines decided to sell.

Because an airline can lose that valuable asset if it doesn’t use it at least 80% of the time in a six-month period, you might see some unusual scheduling. At one point, British Mediterranean Airways was operating round-trip flights between Heathrow and Cardiff Airport in Rhoose, Wales — a journey of just a few hours by car or train — with zero passengers, angering environmental activists (among others). And with demand for air travel having decreased during the ongoing COVID-19 pandemic, some airlines aren’t canceling their underbooked flights, leading to more empty planes journeying through the skies.

Your Confiscated Items Might Be at Auction

Security man at checkpoint in airport exploring luggage on an x-ray screen. — Credit: Frame Stock Footage/ Shutterstock

Ever wonder where your favorite nail clippers and corkscrews went after airport security confiscated them? In some states, they end up in government auctions — and they sell in bulk.

Collections of forbidden goods, from 12 pounds of flashlights to 7 pounds of cigar cutters to an assortment of foldable shovels, end up on government-asset marketplace GovDeals.com. There are so many pocket knives that they get sorted into different categories before going on the market, ending up in lots of 100 generic-brand knives; 14 pounds of knives with names, dates, or locations on them; or 14 pounds of small-size Swiss Army Knives.

Lost luggage is also sold if it’s not picked up within three months, but the process is a little more streamlined. A reseller called Unclaimed Baggage sorts through and resells, repurposes, or recycles the bags and their contents. Speaking of airport security …

TSA Collects Your Loose Change

Airport security check with containers filled of personal belongings. — Credit: Jaromir Chalabala/ Shutterstock

With hundreds of thousands of travelers throwing wallets into bins every day, some loose change is bound to fall out and get left behind. Over time, that really adds up; in 2020 alone, the Transit Security Administration (TSA) gathered more than $500,000 in loose change, and that’s during a pandemic — in 2019, they picked up more than $900,000. The biggest source of lost change was Harry Reid (formerly McCarran) International Airport near Las Vegas, where passengers left behind $37,611.61.

The TSA has to submit reports to Congress every year on how much they’ve gathered and what they spent it on. They ended 2020 with $1.5 million, including money leftover from previous years, and spent much of it on pandemic mitigation measures like masks, gloves, and face shields.

Airport Nap Hotels Exist

A sleepbox, a capsule hotel in Xianyang airport, for passengers taking a nap in between flights. — Credit: Zhang Peng/ Lightrocket via Getty Images

During a longer layover or delay, travelers sometimes stay at nearby hotels, then head back through security to catch their next flight. But if you just need a quick nap or a moment of quiet — or you’re worried about oversleeping — transit hotels are located literally inside the airport.

Aerotel has locations throughout Asia (and a few outside) for some sleep and a shower between, before, or after flights, whether you need an hour-long nap or an overnight stay. Yotel, with airport locations in Amsterdam, London, Istanbul, Paris, and Singapore, fills a similar niche: You can book as little as four hours in a relatively barebones room, with a bed or two, shower, and Wi-Fi.

More traditional hotels built for regular sleeping also exist inside airports, but often offer shorter-term options designed for decompressing during a layover — you just might pay a little extra for the bells and whistles. The Hilton Munich Airport offers a two-hour spa card, and Grand Hyatt DFW and JFK’s midcentury-themed TWA Hotel both offer fixed day-use rates that include access to the pool (starting at $109 in Dallas and around $149 at TWA).

Therapy Dogs Are An Increasingly Common Amenity

A young girl pets a therapy dog at San Francisco International Airport. — Credit: Justin Sullivan/ Getty Images News via Getty Images

Anxious before your flight? Need a little dog cuddle? As of August 2021, dozens of airports in North America had some kind of therapy dog program, whether it was daily dog visitors or a once-a-month treat. One of the biggest operations is the Pets Unstressing Passengers (PUP) program in Los Angeles International Airport (LAX), which had around 121 dogs participating before the pandemic — most of them rescue dogs, and all of them with appropriate certifications and on-the-job experience. Each dog has a handsome red vest and weekly shift of 1-2 hours, and handlers double as customer service reps that can help you find your way to the correct gate.

Each therapy dog program is as special as its four-legged volunteers. Fort Lauderdale-Hollywood International Airport (FLL) in Broward County, Florida, has eight “FLL AmbassaDogs” that include a Yorkshire Terrier named Tiffany who rides around in a stroller. At the Edmonton International Airport in Alberta, Canada, pups and handlers wear matching outfits and distribute trading cards. In 2016, the San Francisco International Airport (SFO) added a Juliana pig named LiLou to its “Wag Brigade.”

Michelin stars were originally connected to an effort to boost tire sales.

Make Every Day More Interesting.

The word “tire” is short for “attire.”

The Michelin Man is known in France as __.