Romulus — The two ExpressTram trains at Detroit Metropolitan Airport's McNamara Terminal will be out of service for three months during a project to update their operation, an airport official said.

"The technology (software/hardware) of the trams is being upgraded to improve reliability, safety and efficiency," said Lisa Gass, an airport spokeswoman.

Gass urged travelers to give themselves extra time to get to their gate.

"While we have been communicating with our customers about this update since last fall, we want to remind them the moving walkways will be operating during this time and wheelchair assistance is available," she said.

"There are signs posted throughout the McNamara Terminal. Messages regarding the trams are printed on all boarding passes, and information is available through the Fly Delta app."

One of the trams has been offline since September. On Tuesday, officials said the other will remain inoperable until April 12 as the project enters its final phase. 

The total cost of the project is $13 million. 

The controls and software are being provided by Rockwell International. Otis is installing and maintaining the equipment. 

About 35 million passengers traveled through Detroit Metro Wayne County Airport in 2017. The airport, the state's largest, offers more than 1,100 flights per day.

The driverless, elevated trams are a highlight of the McNamara terminal — which opened in 2002 — and stop at three location along the A concourse. 

The cars operate 21 feet above the concourse and ride on an air cushion, similar to a hovercraft. The track is more than 3,700 feet long.

Twitter: @CharlesERamirez

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