Narrative:

Air carrier X was initially climbed to FL330 on dawgs departure on J14. Air carrier Y was stopped at FL310 on the debie..bgred departure off clt. Air carrier Y was stopped under slow citation on same route at FL320. With trainer and d-side; collectively agreed to stop air carrier X at FL300 and turned air carrier Y to allow to get to requested altitude quicker. Clearance was given to stop air carrier X at FL300 and an air carrier Z; 50 miles ahead on J14; read the clearance back and neither of us caught the readback error nor did the air carrier X. The halo was on air carrier Y at FL310 with air carrier X passing underneath when saw the air carrier X go through FL304 and immediately questioned his clearance and the air carrier Z said they thought that was them and they were the ones who read it back. Air carrier X said they were still climbing to FL330. Therefore a loss of vertical separation occurred between air carrier X and air carrier Y. This all occurred after a very busy time when all clt arrivals in the stram had to be vectored with s-turns to bleed off high tma numbers.

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Original NASA ASRS Text

Title: ZTL Controller described a loss of separation when two company aircraft accepted the wrong ATC clearance causing the separation loss; one reporter claiming the subject company pilots frequently confuse their call signs.

Narrative: Air Carrier X was initially climbed to FL330 on DAWGS departure on J14. Air Carrier Y was stopped at FL310 on the Debie..Bgred departure off CLT. Air Carrier Y was stopped under slow Citation on same route at FL320. with trainer and D-Side; collectively agreed to stop Air Carrier X at FL300 and turned Air Carrier Y to allow to get to requested altitude quicker. Clearance was given to stop Air Carrier X at FL300 and an Air Carrier Z; 50 miles ahead on J14; read the clearance back and neither of us caught the readback error nor did the Air Carrier X. The HALO was on Air Carrier Y at FL310 with Air Carrier X passing underneath when saw the Air Carrier X go through FL304 and immediately questioned his clearance and the Air Carrier Z said they thought that was them and they were the ones who read it back. Air Carrier X said they were still climbing to FL330. Therefore a loss of vertical separation occurred between Air Carrier X and Air Carrier Y. This all occurred after a very busy time when all CLT arrivals in the stram had to be vectored with S-turns to bleed off high TMA numbers.

Data retrieved from NASA's ASRS site as of July 2013 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.