Large Transport; Low Wing; 2 Turbojet Eng
Flight Crew Air Transport Pilot (ATP)
Confusion; Communication Breakdown; Situational Awareness; Distraction
Conflict Ground Conflict; Critical; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
General None Reported / Taken
Environment - Non Weather Related; Human Factors
After landing on Runway 13R at DFW; we were cleared to cross Runway 18R; and hold short of 18L on Taxiway WM. I misunderstood the clearance; and thought we had been cleared to cross both 18L and 18R. I verbalized; 'Roger; cleared to cross'; and crossed both runways. We had not been cleared to cross Runway 18L; and I realized this after we crossed and heard an aircraft abort due to traffic on the runway. I believe that rather than saying; 'Cleared to cross'; if I had said; 'Cleared to cross both 18L and 18R'; it would have improved our chances of correcting my misunderstanding of the clearance.
I continued with my After Landing Checklist and hear an aircraft aborting. I looked up and realized that we had taxied across 18L without clearance. I will improve my situational awareness (head-up) in the runway environment and not assume the Captain will hold short even if he acknowledges that he will.
An air carrier crew reported crossing DFW 18R and 18L after being cleared to cross only the right so that a departing aircraft had to abort its takeoff. The First Officer was heads down with a checklist.