B737-700
Flight Crew Multiengine; Flight Crew Air Transport Pilot (ATP); Flight Crew Instrument
Flight Crew Last 90 Days 516
Situational Awareness; Confusion
ATC Issue All Types; Deviation - Track / Heading All Types; Deviation / Discrepancy - Procedural Clearance; Deviation / Discrepancy - Procedural Published Material / Policy
General None Reported / Taken
Company Policy; Human Factors
Our call sign was XXYY and XYY was on the same frequency headed in the same direction. XYY was given direct BRKKK and we read it back and accepted the clearance. After our climb and direct too; ATC advised we had taken Flight XYY's clearance.
Air carrier First Officer reported taking a clearance intended for a similar sounding call sign aircraft.