Air traffic on 5655kHz

This evening, as usually, I was monitoring 5655kHz for some air traffic.
And there it was!
I was able to receive and decode HFDL from HAT-Yai Airport from Thailanda.
What was very unusual was that, on the same frequency, I was able to hear some USB Phone operations.
Anyway, It was impressive that the signal was very clear and noiseless!