"...taxying Blonkity for Wonkity, request traffic and transponder code"

[namate]

Question:

TWR: "ABC, contact departures airborne, runway 12, cleared for takeoff"


Is the 'contact dep airborne' required in the readback as the frequency has already been given in the ATIS?? or is it just "cleared for takeoff, ABC"?

I have been told both so just wondering what you guys think?



Thanks,

Namate