They have helicopters. I wonder if a Navy version of the V-22 Osprey might be useful in ASW?
I can remember when the V-22 was being talked about as a replacement for the S-3. In addition to being able to perform the usual ASW detection with sonobuoys it was suggested it could also utilize the dipping sonar of a helicopter. But it was cost prohibitive. When the Soviet Union fell, ASW dropped by the wayside.