Air carrier flight reported a rejected takeoff at about 100 knots at atl airport due to a ground con...

Narrative:

We were instructed to line up and wait with traffic to cross down field on runway 27R. Tower instructed a host of aircraft to cross the runway. After all of the aircraft had crossed; tower then cleared us for takeoff. I was pm; the captain was PF. Around 80 knots I saw a air carrier Y edging out onto the runway and [I] verbalized this to the captain. Tower then said something like 'air carrier Y; what are you doing? Stop right there.' this; coupled with the fact that the air carrier Y continued moving out onto the runway was enough reason for the captain to call a rejected takeoff (now at around 100 knots). Tower did not instruct us to abort. We safely came to a stop and exited the runway and completed the QRH and appropriate checklists. It seemed as though tower assumed air carrier Y had crossed when we had been cleared for takeoff; but they had actually not even begun to cross the runway. Additionally; it's tough to see taxiway papa (where air carrier Y) while you're at the approach end of 27R. Regardless; we shouldn't have been cleared to take off or air carrier Y's clearance to cross the runway should have been cancelled. I do not know what happened in the tower; but we stopped as soon as we saw it was unsafe to continue.

Original NASA ASRS Text

Title: Air carrier flight reported a rejected takeoff at about 100 knots at ATL airport due to a ground conflict with another air carrier crossing their runway.

Narrative: We were instructed to line up and wait with traffic to cross down field on Runway 27R. Tower instructed a host of aircraft to cross the runway. After all of the aircraft had crossed; Tower then cleared us for takeoff. I was PM; the Captain was PF. Around 80 knots I saw a Air Carrier Y edging out onto the runway and [I] verbalized this to the Captain. Tower then said something like 'Air Carrier Y; what are you doing? Stop right there.' This; coupled with the fact that the Air Carrier Y continued moving out onto the runway was enough reason for the Captain to call a rejected takeoff (now at around 100 knots). Tower did not instruct us to abort. We safely came to a stop and exited the runway and completed the QRH and appropriate checklists. It seemed as though Tower assumed Air Carrier Y had crossed when we had been cleared for takeoff; but they had actually not even begun to cross the runway. Additionally; it's tough to see Taxiway Papa (where Air Carrier Y) while you're at the approach end of 27R. Regardless; we shouldn't have been cleared to take off or Air Carrier Y's clearance to cross the runway should have been cancelled. I do not know what happened in the Tower; but we stopped as soon as we saw it was unsafe to continue.

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.

Attributes
ACN	1708946
Time
Date	201912
Local Time Of Day	0601-1200
Place
Locale Reference	ATL.Airport
State Reference	GA
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Takeoff
Flight Plan	IFR
Aircraft 2
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Flight Phase	Taxi
Flight Plan	IFR
Person 1
Function	Pilot Not Flying First Officer
Qualification	Flight Crew Air Transport Pilot (ATP)
Person 2
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Conflict Ground Conflict Critical Ground Incursion Runway

Air carrier flight reported a rejected takeoff at about 100 knots at atl airport due to a ground conflict with another air carrier crossing their runway.