Flight Crew Air Transport Pilot (ATP)
Distraction; Communication Breakdown; Confusion; Time Pressure; Situational Awareness
Deviation / Discrepancy - Procedural Clearance; Ground Incursion Runway
Air Traffic Control Issued New Clearance; Flight Crew Requested ATC Assistance / Clarification; General Flight Cancelled / Delayed
Chart Or Publication; Human Factors; Procedure; Airport
While operating a flight I experienced an incident during taxi out. We had previously taxied out for departure with an expected delay prior to departure. Ground issued taxi instructions after pushback which put us on the far side of the runway where we could wait out our delay. As I taxied around the terminal; especially since I was unfamiliar with the airport; the taxi instructions bothered me as unclear; so I asked for clarification. Ground then instructed me to cross the runway turn right onto the taxiway and hold short of the runway facing south. I complied with these instructions and we began waiting for our departure time. After approximately 30 minutes; our departure time was extended a further 90 minutes. After a brief consultation with Dispatch; we elected to return to the gate. We received clearance from ground and returned to the gate. This process took longer than normal; as operations was busy with other aircraft.As soon as the last passenger was off the aircraft; Ground called us and indicated our time was had improved and we immediately began re-boarding passengers; loading bags and updating paperwork. After boarding was completed; I needed Dispatch to update performance numbers since we had lost several passengers; Dispatch informed me that they were having difficulty generating numbers and would get them to me as soon as possible. We pushed off the gate; ran our checklists and contacted Ground for taxi. Ground informed us that we had a short wait and that we would 'do the same thing as last time' and that we would 'hold short of the runway...facing south' to wait. I made the 180 degree turn which from the gate which placed us essentially on the taxiway believing that I was cleared just as the prior time to cross the runway then turn right to hold short of the runway from the north side I turned on my lights; visually cleared the runway and proceeded to cross.As I approached the hold short line Ground Control hurriedly instructed me to hold short of the runway. I stopped; but only after the nose had crossed the hold short line. We held that position as per Ground instructions as an aircraft which had been on the approach; but was obscured by the clouds went around and then continued across the runway. At the Ground Controllers request; I called the Tower after stopping short and we discussed that ground had actually originally instructed me to hold short of the runway on which I had not heard or had not understood. We discussed the confusion in the instructions as I had understood them.I feel that the extra taxi distance on the first taxi out gave me an opportunity to mentally review the instructions to find 'red flags' and ask for clarification while the second taxi out was shorter with additional work load applied; therefore leading me to not question what I believed was my assigned taxi clearance. In hindsight; those are the moments; especially at an unfamiliar airport; which require extra vigilance and slowing things down.
EMB-145 Captain reported a runway incursion at CAK airport.