Narrative:

On the taxi in to our assigned gate we noticed that the aircraft [in an adjacent gate] was not a company aircraft; so it immediately peaked our attention as we passed by on the way to our assigned gate next to the other aircraft. We made the left 90 degree turn to line up on the safety zone taxi line. I noticed the proximity of the other aircraft's left winglet and stated out loud to the first officer (first officer) that it appeared as though the other aircraft's winglet was encroaching on our safety zone. We stopped our aircraft and discussed the situation. We were at a 45 degree angle to the wing tip and the left-hand safety line; so we had a bit of parallax. There was a ground agent standing; what appeared to be directly below the winglet of the other aircraft. There were also three orange cones and a ladder lined up with our left safety zone line. We felt as though the person was there to help ensure that we were entering the safety zone with the proper clearance on the other aircraft. We transitioned our sight out the front windscreen to the marshaller and the other personnel stationed directly in front and off to each side of the nose for what we assumed was for the safety zone clearance. The marshaller started moving the wands to bring us into the parking area so we proceeded very slowly because we wanted to make sure that we had the proper safety zone clearance. As we started to move I referenced the ground personnel over my left shoulder one last time and then turned to concentrate on my lineup and the marshaller. About the time I did this the first officer forcefully yelled for me to stop the aircraft. I applied the brakes expeditiously and brought the aircraft to a stop. I immediately turned to look at the left wing tip and realized we had struck the winglet of the other aircraft with our left winglet. We set the parking brake and began to manage the situation. We shut down the motors and worked with operations; dispatch; and maintenance to deplane the aircraft via air stairs. One of the ground personnel informed the first officer that the other aircraft had been towed to the gate and lined up on the wrong parking line which put the aircraft 20 feet to the right of where it should have been parked; obviously infringing upon our safety zone. [I suggest that there are] wing walkers stationed at the end of the safety zone lines to clear the area before we enter into the parking area. Especially when the aircraft parked on either side is not a company aircraft. We had a lot of people on the ramp to clear the safety zone. Poor communication between them contributed to the incident.

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Original NASA ASRS Text

Title: B737-800 flight crew reported contacting another aircraft's wingtip while taxiing into the gate under ground personnel guidance.

Narrative: On the taxi in to our assigned gate we noticed that the aircraft [in an adjacent gate] was not a Company aircraft; so it immediately peaked our attention as we passed by on the way to our assigned gate next to the other aircraft. We made the left 90 degree turn to line up on the Safety Zone taxi line. I noticed the proximity of the other aircraft's left winglet and stated out loud to the FO (First Officer) that it appeared as though the other aircraft's winglet was encroaching on our Safety Zone. We stopped our aircraft and discussed the situation. We were at a 45 degree angle to the wing tip and the left-hand Safety line; so we had a bit of parallax. There was a Ground Agent standing; what appeared to be directly below the winglet of the other aircraft. There were also three orange cones and a ladder lined up with our left Safety Zone line. We felt as though the person was there to help ensure that we were entering the Safety Zone with the proper clearance on the other aircraft. We transitioned our sight out the front windscreen to the marshaller and the other personnel stationed directly in front and off to each side of the nose for what we assumed was for the Safety Zone clearance. The marshaller started moving the wands to bring us into the parking area so we proceeded very slowly because we wanted to make sure that we had the proper Safety Zone clearance. As we started to move I referenced the ground personnel over my left shoulder one last time and then turned to concentrate on my lineup and the marshaller. About the time I did this the FO forcefully yelled for me to stop the aircraft. I applied the brakes expeditiously and brought the aircraft to a stop. I immediately turned to look at the left wing tip and realized we had struck the winglet of the other aircraft with our left winglet. We set the parking brake and began to manage the situation. We shut down the motors and worked with Operations; Dispatch; and Maintenance to deplane the aircraft via air stairs. One of the ground personnel informed the FO that the other aircraft had been towed to the gate and lined up on the wrong parking line which put the aircraft 20 feet to the right of where it should have been parked; obviously infringing upon our Safety Zone. [I suggest that there are] wing walkers stationed at the end of the Safety Zone lines to clear the area before we enter into the parking area. Especially when the aircraft parked on either side is not a Company aircraft. We had a lot of people on the ramp to clear the Safety Zone. Poor communication between them contributed to the incident.

Data retrieved from NASA's ASRS site and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.