Knee Defenders may be all the rage after a brouhaha on United Airlines, but passengers on Canada's major carriers will just have to live and let people lean back.
Knee Defenders work by clamping on to tray tables and stopping seats from stretching out.
WestJet lists the devices among items that cannot be attached to seats, alongside booster seats and belt extensions.
Air Canada also doesn't allow them, a company spokesperson told CTV News.
But the device, which is listed at $21.95 on its website, is not banned by either Transport Canada or the Federal Aviation Administration, as both authorities leave it up to airlines to regulate themselves.
The United Airlines incident took place during a flight from Newark to Denver on Sunday.
A male passenger seated in Economy Plus, which has more leg room than in coach, used a Knee Defender and refused to remove it when asked by a flight attendant (the airline doesn't permit them).
The woman sitting in front then threw a cup of water at him. Both passengers were later kicked off the plane during an unscheduled landing at Chicago's O'Hare International Airport.
Ira Goldman, the inventor of the Knee Defender, told USA Today the device, despite its purpose, still encourages people to accommodate the needs of other passengers.
"... the Knee Defender says right on it: 'Be courteous. Do not hog space. Listen to the flight crew.' Apparently that is not what happened here," said Goldman about the incident.
CNN reports coverage of the story has boosted sales of the Knee Defender but it also sparked a debate on whether the device should be permitted at all.
"It's tailor-made for bullies," claimed a Chicago Sun-Times editorial. "Best we can tell, the most obvious purpose of a Knee Defender ... is to make it possible for one passenger to impose his will on another."
ALSO ON HUFFPOST:
See More of America's Worst Airports Travelers of all stripes gripe about the Little Rock airport’s security lines, which have made local headlines for wait times that can stretch to an hour. It also scored poorly for check-in, delays, design, food, and shopping. In part, the results may simply reflect the fact that this is a small airport, with no airline clubs and barely a handful of stores and restaurants. It does deserve kudos for providing free Wi-Fi. Photo: Jeff Greenberg / Alamy
See More of America's Worst Airports What is there to love about LGA? Not much. It gets pitiable marks for the shopping and food options in its dilapidated halls. (This is an airport notorious for putting out buckets to catch the drips from its ceilings.) One of the smallest major airports, LaGuardia was not designed to accommodate a sprawling 21st-century security apparatus. And travelers have noticed: its check-in experience was voted worst among 67 domestic airports. Photo: Courtesy of The Port Authority of NY & NJ
See More of America's Worst Airports You’d think that Billings, a gateway to Yellowstone National Park, would have an unremarkable—or even charming—airport. Think again. Billings Logan seems to have rubbed fliers the wrong way. T+L readers disapproved of its design and felt it was plagued by flight delays. As for food and shopping, the sage advice is to eat lunch and get your Montana souvenir before you hit the airport. Photo: Andre Jenny / Alamy
See More of America's Worst Airports Flight delays and lengthy lines at check-in are perennial gripes about Newark, as is the location. (Tip: taking NJ Transit to midtown Manhattan will save you money as well as time otherwise stuck in traffic.) The shopping and food options don’t come close to elevating Newark, nor does the outdated design. Photo: Songquan Deng / Alamy
See More of America's Worst Airports A solidly poor performer in our reader survey, Birmingham–Shuttlesworth comes across as plagued by delays and check-in issues. Its location ranks a lowly 52 out of 67 airports. It’s a small airport, with just a few lackluster shops and places to grab a bite, so perhaps understandably doesn’t stand out in the food or shopping categories. While it may be unfair to compare it to its big-city brethren, many travelers seem to do just that. The construction of a modern terminal (already partially operational) may improve their impressions. Photo: Craig Holmes/LOOP IMAGES/Loop Images/Corbis
See More of America's Worst Airports JFK rated a notable 23rd for its shopping possibilities, with a selection sure to please those with expensive and eclectic tastes (Bulgari, Coach, Harley-Davidson). Then it largely went downhill. Readers griped about systemic flight delays and glacial check-in lines. After all, JFK grapples with more international inbound visitors than any other U.S. airport. The recent opening of Delta’s Terminal 4 should improve the experience for some travelers (thanks to modern comforts like numerous electric outlets and a Shake Shack outpost). Photo: Courtesy of The Port Authority of NY & NJ
See More of America's Worst Airports It’s rare to hear an encouraging word about LAX. So when readers declare that the airport’s shopping is respectable—giving it a ranking of 36 out of 67—that may be a backhanded compliment. Check-in, design, and location were all considered a drag. But things should look up for travelers at LAX with the expansion and renovation of Tom Bradley International Terminal. It reopened in September 2013 with massive LED multimedia screens and charging stations; many restaurants and shops are scheduled to roll out in the coming months. Photo: 2007 Los Angeles World Airports