People say Chicago has only two seasons: winter and construction.

So, with the weather warming up and traffic at its worst, it may not be surprising that some users of flight tracking apps noticed one flight that seemed too unusual to be true: A 20-mile United Airlines flight from O’Hare Airport to Midway Airports on Monday.

“I didn’t believe it was real so I had to look it up. Who is taking this, and WHY?????” Tim Regan wrote on Twitter.

Although the flight did happen, it was merely the airline repositioning a charter plane, according to United spokesman Charles Hobart.

It’s common for airlines to reposition charter flights, Hobart said.

And although the flights have no passengers, they still appear on flight tracking websites due to federal rules about airlines sharing their flight manifests, he said.

“This is very common, not only for United but for other major carriers,” Hobart said.

One social media user deduced from the plane’s tail number that this was the same charter plane used by the White Sox.

United wouldn’t confirm it was the team’s plane, and a spokeswoman for the team did not immediately reply to a request for comment.

Other social media users questioned the practicality of an in-town flight, considering the travel time to the airport and the flight costs on top of that.

“Beats driving in that traffic,” one person replied on Twitter.

“Maybe construction traffic is just that bad,” another person said.

“Absolutely amazing. Plus Chicago taxes you on both ends I do believe,” said one user.

Even with a top in-flight speed of 300 mph, the plane clocked a 35-minute flight time, according to the flight tracking website FlightAware.

A drive from O’Hare to Midway during the same time, around noon on Monday, would’ve taken 55 minutes, Hobart tweeted.