Against the drones, that would be difficult to prevent, but the limitations imposed by the transmitter gear (size, weight, inverse square law of area being jammed) would probably limit the impact.
The dedicated platform would be located via signal strength analysis and likely physically destroyed.
Not in the context of an airport security.
Mine was that the noise generation was part of the adversary's actions (as is the presence of the drones themselves).
Are you suggesting that the noise (+encrypted data) is part of the airport's standard procedures, and authorized users pick out (and decrypt) the data, and everything else (like Command & Control) of adversarial devices is overwhelmed by the overall noise?
(Not my core field, so this is SWAG-ish): There is also a separate but equally important problem of signal vs noise - isolating the signal for decryption. Doable, but fairly costly to implement, and far more brittle than I suspect would be acceptable.