A new report finds the project to build a new AirTrain at LaGuardia airport would be the world’s most expensive transit project per rider. 

The AirTrain from the Mets-Willets Point stop in eastern Queens to LaGuardia is expected to cost $2.1 billion —and will only serve about 6,000 train riders a day, according to the watchdog group Reinvent Albany.

When the project was pitched, the Port Authority put the daily number much higher because it included people who would drive and park at the AirTrain parking lot.

Reinvent Albany calls it an extremely expensive shuttle service — and says the idea that this is a climate friendly project is "bizarre" because it will not get cars off the road.

Governor Kathy Hochul could kill the project, but she hasn’t said whether she would.

 After the story was published, Rick Cotton, Executive Director of The Port Authority of New York and New Jersey emailed a statement in response to the Reinvent Albany report: "That is a ridiculous calculation. That calculation is applying the full cost of the AirTrain, which will be operating for 50 years, to one day’s ridership.”