flying_hamster
I do not know what HR are doing now or how they conduct their business, but I hear that they are handling well in excess of 10,000 applications. Couple that to the fact that there are only a few recruitment ladies processing everything that is related to cadets, and it's not hard to see why they are especially slow. Have patience!
Though having said that, I would suggest you e-mail them and request them to change your interview location. IMHO it is better to be proactive, rather than wait for them to get to you. I don't know if it will work or not, but it is an option.
Best of luck!!