With the option, called Upfront Plus, passengers can choose either a window or aisle seat, and the middle seat will not be taken for flights departing on or after April 10 and through April 30.
In addition to the extra elbow room, the seats will also come with extra leg room.
The seats will be located in the first two rows of the plane.
The upgrade costs about $50 per passenger. Flights must be purchased by March 20.
More information can be found on Frontier's website.
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