Airtrax used to be a real company, however it ceased operations in 2008. The vehicle in the movie seems to be a "sidewinder" Omni-Directional Lift Truck (ATX-3000). It was introduced in 2005. It was produced until June 2013 under the brand name Airtrax, by a company called Vetex. Its wheels use the "Omni-Directional drive system" allowing the vehicle to maneuver in any direction, even sideways. The unique appearance this gives the vehicle is probably why it was selected for the film.
Another Airtrax type forklift appeared in Star Trek Into Darkness, but since the branding seemed to be removed, it is unclear if it was intended to stand in for a forklift from this brand.