I need to buy airline tickets to go to Ktm for Dashai.  My initial search showed Jet Airways as the cheapest option; round trip from EWR for around $1500 in coach.  I have never flown Jet Airways, nor have I flown through India.  If you have, please help me by posting your answers to following questions:

• How is Jet Airways?  How would you compare it to Cathay Pacific or Singapore Airlines?
• Will my luggage be checked in all the way to KTM (and directly to the US on the way back) or do I need to checkout/checkin in Delhi/Bombay?
• How is the layover in Delhi?  
• Looks like I have to stay overnight there, what are my options as far as hotels are concerned?
• Is there a hotel within the airport so that I do not have to go through Indian immigration?
• Is there anything I need to be concerned about in regards to traveling via India?

Thanks in advance.