Pearson, you're probably right. I forgot about the new regional airlines that have sprung up in India that exclusively fly small turboprops. That having been said, the drive from Chandigarh to Simla over mountain roads is far more exciting than a flight there. I did it 10 years ago. Frankly, Simla is a bit of a let down though - it may have been charming 30 years ago. There are lodges and hill resorts several miles outside of Simla which avoid the crowds and traffic of Simla (Yes, I've seen traffic gyms on roads at 9000 ft), which are a better choice. And, if you really want to fly over mountains, then I suggest the flight to Leh in Ladakh. For one, you'll be on a 737 (IC or Jet) and the views from the plane are amazing !! In the 1980s IC allowed photographs of the 20,000+ ft peaks but I'm sure they won't allow it now.
Atheism is Myth Understood.