Running 7 trains to airport will not be beneficial to passengers. Such trains may be suitable for staff working in various airlines and in airport departments.
For Bangalore passengers, there should be dedicated trains between airport to city. Hourly trains from SBC YPR BNC KJM to airport should be run.
For those from Mysore side, Tumkur side and Hosur side, there should be atleast two trains one in the morning (to reach by 11 AM) and one night train (to enable catching early morning flights).
For...
more... DBP side passengers, there can be few shuttle between DBP and Devanahalli. Those coming by road can change over to train at DBP station (which is on the main road itself).