Large Transport; Low Wing; 2 Turbojet Eng
Air Traffic Control Fully Certified
Air Traffic Control Time Certified In Pos 1 (yrs) 2.5
Confusion; Communication Breakdown; Situational Awareness
ATC Issue All Types; Deviation / Discrepancy - Procedural Published Material / Policy
Procedure; Aircraft; Company Policy; Human Factors
Aircraft X called for taxi and I gave him taxi instructions to the departure runway. I spoke with the aircraft multiple times and did not hear the callsign any differently; nor did the pilot try to correct me from my knowledge. As the aircraft was cleared for takeoff by the Local Controller; the pilot must have made his callsign out more clearly to him than it had been to me; because the Local Controller turned to me and advised that it was actually Aircraft Y [a company callsign with a one number difference] on departure roll. Very similar sounding callsigns; very similar aircraft types. We should advise the company that there is no reason to have such similar callsigns with proposed departure times only 10 minutes apart.
JFK Controller reported two aircraft with nearly identical call signs caused the wrong flight to be coordinated.