Commercial Fixed Wing
Flight Crew Instrument; Flight Crew Air Transport Pilot (ATP); Flight Crew Multiengine
Flight Crew Last 90 Days 166; Flight Crew Total 3604; Flight Crew Type 258
Communication Breakdown; Confusion
ATC Issue All Types; Airspace Violation All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Published Material / Policy; Deviation / Discrepancy - Procedural Clearance
Air Traffic Control Provided Assistance; Flight Crew Returned To Clearance
Human Factors; Procedure
Due to NOTAM A0XXX/XX for military airspace; Dispatch filed us off R465 between CORTT and CUNDU. However; the PDC looked identical to standard R465 routing; because not all intermediate fixes are listed on the PDC. Pilots mistakenly interpreted this to be a removal of the non-standard latitude longitude; and contacted both Dispatch and Honolulu Center to verify the removal of [latitude/longitude] from route; and therefore standard routing on R465; CORTT to CUNDU. Both Dispatch and Honolulu Center indicated military space was not hot; and routing was back to normal on R465.Immediately after CORTT; via CPDLC; Oakland Center questioned our routing and then instructed us to offset right of course 25 miles between CORTT and CUNDU to avoid military airspace; and we complied. After parking [at destination]; pilots phoned Oakland Center and discussed the incident. Oakland said they had reviewed it with Honolulu Center; and they could understand how Honolulu misunderstood our verbal requests for route clarification. Thanks to Oakland's quick action at CORTT; we never entered military airspace.Considering the hundreds of lines of information delivered to the cockpit printer every flight; the routing instructions on the PDC should never be abbreviated. We thought we had clarified the routing ambiguity with Dispatch and ATC; but we were wrong. In hindsight; we should have requested a full route read back from ATC at anytime from the receipt of the PDC until approaching CORTT; and recovered from this miscommunication without incident.
Air carrier First Officer reported erroneous clearance provided to flight crew by Dispatch and ATC was corrected by Oceanic ATC sector.