Travelling from india to united states is a long journey of 15-17 hours.In india 15 hours is not a big time as we generally whenever we move from one state to another it take such long times by train,bus,car.

When you are travelling by air it is big thing as it is not so flexible to move here and there.any time anoucement may be made to tie your seat belts.

and the rest of comfort depend on the class you prefer to travel .generally there are four classes of travel in air flights

1.First Class:-It is Highest level of class which is very near to aircraft ans less in number so that the person traveeling in this class ,they can be cared well,the get good privacy,good service and they are taken more  care in flight.,in terms of security also they are more secure economy and business class people can not enter first class cabin.rest of the things are almost same as economy class.some airlines offer fully flat movable seats in this class which is very  comfortable.

2.Economy Class:-It is cheapest class and most of people prefer to travel in this class only.it provides almost all amenities for time pass like a good seat with belt,air sickness bag.magazines,a TV,a catalogue for safety precautions,headphone,meals veg or non veg as per your chocie you get lunch dinner  breakfast, snacks and coldrinks ,juice(as per time and journey period)

3.Buisness Class:-it is also one of the highest class in  air travel in a international either or both can be among highest class.but if both class seats are available then first class is a highest and then comes buisness class.cradle or angled seats can move up to 180 degress are available in this class which are very  relaxed.

4.Premium Economy;-some of the flight use this term in place if economy class.

I prefer to travel in Economy class which is cheap and good in ammenities ,if you need full relaxation and want to sleep well you can try for higher class but this may add much more money to your budget..

choice is yours :) happy journey!!!!!!!!!!!!!!!!!!!!