Medium Large Transport
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 1.5
Situational Awareness; Confusion; Distraction
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Chart Or Publication; Human Factors; Procedure
Aircraft X was on a departure; which takes the aircraft several miles south of [the airport]; then turns them out to the east. Lead Controller East (LCE) cleared Aircraft X for takeoff. As he climbed past the departure end of the runway; LCE instructed the pilot to contact departure. Seconds later; Aircraft X was observed in a hard left turn to the east. LCE scrambled to coordinate with the departure controller; but fortunately there were no conflicts with other aircraft and the departure controller kept Aircraft X in his turn. However; this is a common occurrence at [this airport]. The departure is flown over a hundred times a day and by each airline serviced by ATCT; but Aircraft X's Company is the only airline that ever deviates from it. I would estimate twice a month a Aircraft X company jet deviates from the SID and turns early. Typically; the LCE controller or even the departure controller is able to turn them back to the SID; but this is critical because an early eastbound turn from [departure airport] (in a south flow) cuts directly across the departure corridors at both [nearby] airports. The controllers at [departure airport] know to watch specifically for [a specific carrier] to turn early on that SID; but they should be able to expect a pilot to follow the SID every time. I have never seen any other carrier make this error; just Aircraft X's Company.The problem must be with the onboard equipment in the Aircraft X [company aircraft]. I would like to see Aircraft X company address the equipment issue; and/or educate the pilots on the matter. The airspace between [nearby] airports can get extremely congested; with both VFR and IFR aircraft. I believe it is only a matter of time before a significant occurrence due to an unexpected turn by a jet through this airspace.
Tower Front Line Manager (FLM) reported an aircraft and others with the same company deviate from the assigned SID. The reporter stated this is the only company he sees that do this. The aircraft departed and turned the wrong direction. This turn cuts right across two other ATC control zones.