It would be mostly Delta now to add the flight to hyderabad.I think it is only a matter or time before HYD gets directly connected to USA.
The traffic should sizeable already. MNC investment is booming and Development centres, Aerospace and Pharma will drive growth. Even among VFR traffic, Hyderabad, Telangana and Andhra area has high-yield casual travellers.
However, not sure which would be the preferred port of call for travellers too and from HYD.
DTW? New York Tri State? LAX?
Which is I think the problem. Demand is too dispersed which is met by Air India Delhi Hub, Middle East carriers and East Asian hubs.
AA i doubt they will add another route to india until they gauge the response on their BLR flight.
I am pretty sure KLM will add something to europe this year mostly if they get some more dreamliners.