Commercial Fixed Wing
Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Total 3200
Situational Awareness; Communication Breakdown; Confusion
ATC Issue All Types; Deviation / Discrepancy - Procedural Clearance; Ground Incursion Taxiway
Air Traffic Control Provided Assistance; Flight Crew Requested ATC Assistance / Clarification
Environment - Non Weather Related; Human Factors; Procedure; Airport; Company Policy
Taxiing out we were given a taxi clearance to Runway XXR intersection XX [taxiway]. The FO and I both heard a non standard taxi route 'XXR XX; A; XXX' and the FO read it back and wrote it down. My experience at ZZZ gave me the impression this was a non standard route. Due to the non standard nature of our airports at this time; it wasn't out of the ordinary to get alternate taxi routes. I turned left on XXX [taxiway] and the Controller then issued a right turn ZYZ [taxiway] and a left turn Z [taxiway] to continue to XXX then Y [taxiway].I have flown very little in the past 45 days and heard an incorrect taxi clearance. I also didn't question the 'odd' taxi instructions we copied because of getting similar 'unfamiliar' taxi instructions the past  3 months at ZZZ. The FO was ZZZ1 based and was also relying on my judgment for this taxi route. The busy frequency made the instructions unclear and we were not corrected when the FO read back the incorrect taxi instructions.I should have queried the Controller for clarification when I was given a 'non-standard' taxi route.
Captain and First Officer misheard taxi call. We were departing and Ground told us to take a right on A [taxiway]; then follow company traffic at XXX; then left on XXY to Z. We both heard Right on A; left at XXX; then right on Z. That's what I read back and ATC didn't correct us. Once on Z; ATC told us to take a right to follow company traffic. No issues were noted and there were no threats. We corrected the mistake as soon as ATC notified us of the error.Cause - Busy airport. We misheard the call; read back what we heard and weren't corrected at the time by ATC.Suggestions - Clear; concise communications and if there's a mistake in the read back; ATC should identify it.
Air carrier flight crew reported a taxiway incursion after receiving a non-standard taxi instruction.