Over 200 travellers are once again furious with a Canadian airline's lack of communication after being corralled into what one passenger described as a "basement detention centre" mid-flight without being told why or when they would be released.

The 10 a.m. Sunwing flight from Toronto's Pearson Airport to Cancun was forced to make an emergency landing in New Orleans on Saturday around 1:30 p.m. due to a mechanical issue.

Passengers reportedly waited inside the plane on the tarmac at Louis Armstrong International Airport for four hours before they were forced to disembark for regulatory reasons.

Update 🔀 DIVERSION
Sunwing #WG511
Toronto to Cancun diverted several hours ago to New Orleans after an engine failure. Passengers were provided water & pizza. Now waiting inside a small area of the terminal. Replacement aircraft planned not yet enroute. pic.twitter.com/3ADBNiNPhj

— Tom Podolec Aviation (@TomPodolec) March 30, 2019

With no room inside the New Orleans airport to accommodate 239 people, however, the Sunwing customers were instead shuffled into what one told CBC was "a closed room that looked like a big hallway or tunnel."

Stuck at new orleans in a basement which feels like a detention center with no idea what is happenings...#sunwing #horrible pic.twitter.com/eY120XqQNM

— Robert Liu (@robbio09) March 30, 2019

There, they had to wait until Saturday night for a plane to arrive from Miami and complete the journey to Cancun—but passengers didn't know at the time how long they'd be in New Orleans for or even why, specifically, the jet was forced to land.

@SunwingVacay sitting in New Orleans when we should have been in Cancun five hours ago with ZERO updates from your company. Take our money and treat us like cattle. Let’s see how many hoops I have to jump through to get any money back for your incompetence.

— Heather Jay (@HSadura) March 30, 2019

Some on Twitter described the experience as "terrifying," noting that the airport basement didn't even have chairs.

Worst experience ever! @SunwingVacay After terrifying emergency landing, to add insult to injury, we were left in New Orleans basement for hours with nothing but a concrete floor to sit on. NEVER again.

— kathy somers (@katykersh) March 31, 2019

Others declared their entire vacations ruined, vowed never to fly Sunwing again and reached out to the company publicly after failing to reach the airline's customer service centre by phone.

@SunwingVacay in-laws stuck in New Orleans, supposedly just crammed in a hallway. This is after they were on a plane for 4 hours after emergency landing. No updates. No staff. No new plane. And as per your Twitter feed this is nothing new. What is going on?!

— Tracy Morris (@TracymRD) March 30, 2019

People were so irritated that some passengers report a fist fight breaking out in the underground holding area.

Comfortable!?!? Oh you mean cramming all 260 passengers into a customs hallway - people are so angry , 2 full grown men just got into a fist fight. Real comfortable Sunwing, how about an update, by a real person?

— Jessica (@_JessLj) March 30, 2019

Eventually, after roughly three hours off the plane, passengers were able to board a different jet and continue on safely to Cancun.

"We didn't have our staff on the ground to support communications," said Sunwing in a statement after the fact. "Because of the unplanned nature of the landing, the airport was very busy and it took many hours to find a secured area for our customers to deplane to."

"We are very apologetic for this unfortunate start to their vacation and have compensated accordingly."

Sunwing suspende los vuelos de #Boeing737Max por "razones comerciales en evolución" pic.twitter.com/Wd578yHbAK

— Luces del Siglo (@lucesdelsiglo) April 1, 2019

A few weeks ago, on March 12, Sunwing became the first Canadian airline to announce that it would be temporarily suspending all four Boeing 737 Max 8 jets within its fleet.

The move came in response to mounting pressure from travellers to ground the planes after 157 people were killed in an Ethiopian Airlines crash involving the same model.

Canada joined dozens of other countries on March 13 in banning the Boeing plane model from its airspace.

The plane that experienced mechanical issues on Saturday was a Boeing 767-300. It had been leased from Eastern Airlines by Sunwing to supplement its fleet in light of the Max 8 aircraft ban.