here is some frequency details for hf aeronautical communications in india.
11285, 5670, 6655, 3470 - chennai oceanic air traffic control
10018, 8879, 5658, 3467 - bombay hf air traffic control
8861, 8909 - these frequencies are used for local traffic control.
these frequencies will be of interest to friends who will be doing dx hf monitoring originating from india.