Narrative:

Flight lga-mia. Mia approach had company flight X heavy and company flight Y heavy on frequency 125.75. Approach clrd company flight Y heavy to turn left to 100 degrees and des from 4000' to 3000'. First officer read clearance back. About 2 mins later approach gave flight Y heavy an immediate climb to 4000' and right turn to 340 degrees. He said the original clearance was for flight X heavy. Controller clrd Y heavy. Copilot read back Y heavy transport. Seemed to be a mix up between sound-alike flight numbers X and Y. Could have used a 'caution--company flight X and company flight Y on same frequency.'

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Original NASA ASRS Text

Title: SAME COMPANY ACR WDB READ BACK AND INITIATED CLRNC FOR COMPANY FLT WITH SIMILAR SOUNDING A/N.

Narrative: FLT LGA-MIA. MIA APCH HAD COMPANY FLT X HVY AND COMPANY FLT Y HVY ON FREQ 125.75. APCH CLRD COMPANY FLT Y HVY TO TURN LEFT TO 100 DEGS AND DES FROM 4000' TO 3000'. F/O READ CLRNC BACK. ABOUT 2 MINS LATER APCH GAVE FLT Y HVY AN IMMEDIATE CLB TO 4000' AND RIGHT TURN TO 340 DEGS. HE SAID THE ORIGINAL CLRNC WAS FOR FLT X HVY. CTLR CLRD Y HVY. COPLT READ BACK Y HVT. SEEMED TO BE A MIX UP BTWN SOUND-ALIKE FLT NUMBERS X AND Y. COULD HAVE USED A 'CAUTION--COMPANY FLT X AND COMPANY FLT Y ON SAME FREQ.'

Data retrieved from NASA's ASRS site as of August 2007 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.