Incident Details
The local controller first positioned Simmons 4058 on Runway 9L, then positioned Simmons 4158 on Runway 4L. The controller returned to Simmons 4058, stated the runway number, and cleared it for takeoff. Before Simmons 4058 had a chance to reply, Simmons 4158 acknowledged the clearance. Simmons 4058 queried the clearance. Realizing the confusion, the controller canceled Simmons 4058's takeoff clearance. Simmons 4058 replied, "We thought that was gonna happen."
Pilot Slowdown
At the time of the incident, a pilot 'slowdown' was taking place. Controllers stated that pilots were taxiing more slowly than usual and appeared to get lost or confused on the ground more often. The crew of Simmons 4158 vehemently denied participation in the union-related work slowdown.
Safety Board Recommendations
The Safety Board has issued recommendations addressing similar flight call sign confusion.