Laser plane is an item that Henry can choose once he is in his cell, following the Wait for Transfer option at the start of Fleeing the Complex. It is a small, plane-shaped, hovering robot that emits a laser beam powerful enough to cut through solid concrete.
When chosen, the laser plane will cut a rectangular hole in the floor, which falls into the room below, crushing a guard and allowing Henry to reach this room. This results in a success, as leads to the Phone a Friend option.