Planes used to have an EMP stiletto, that would EMP a huge area for 7s stun time in a wide area. This is now a disarm plane, thank god.
Howevs - I think there is a definate niche single-target EMP plane around the same cost point (~600), like a flying infiltrator. Used with Ravens, it would allow them to hit a mobile target like a com without diving. It could be used to shut down single high value targets like Golly/DDMs with a reliability that the Stiletto dosn't have (often only partially-disarming heavies).
The Kestrel model is still awaiting application, and having it fire EMP missiles and turn away at a distance as the current Kestrel does would make it a survivable way of hurting the shields of shieldballs. Planes lab uses a monotonous composition at the moment (spam swift if VS planes then Stiletto/licho).