This thread is all over the place.

First OP is concerned between EWR and JFK
Then OP moves focus to which airline is best quality between DEL and NYC
then OP is advised that all coach is approximately same and choose based on price.
Thread continues on to discuss various airlines and connecting airports
Then OP announces he actually wants to go to Dover, Delaware.
OP is advised to fly to PHL
Then OP replies that he wants to fly only to EWR or JFK
Then OP states he is looking for tickets to PHL
Then OP is advised to fly LH to PHL
Now OP does not want to fly LH to PHL because of $70 fee for second baggage piece.

OP is all over the place and this thread is a waste of 180 posts. Why is OP even buying a ticket now if flight is not until 9 months from now. Schedules are sure to change anyways. Not like this is an award ticket or some ridiculously low fare.

OP should just wait 6 more months and then buy the ticket with best combo of low fare and convenient schedule. I don't really see what is the point is buying now and I don't really see the point in debating the pros and cons of various carriers when OP seems fairly price conscious and will likely buy based on price and should not even buy for several months.

This thread is akin to me asking several internet users to debate buying a Rolex vs. buying a Tag and then six months later deciding to buy a Timex because it tells time well and does it at 5% of the price.