Of the sites listed above, go with SideStep and/or Kayak, and Mobissimo.com
as they scour not only the airline websites, but also the major online travel sites as well. Using them is a good place to start, as sometimes you can actually get a better deal on an airline's website.
Unfortunately, none of the East Coast discount airlines offer nonstop flights between NYC and BOS
. The majors pretty much have NYC-BOS
for themselves for the time being. AirTran would require flying LGA
; Southwest would require a routing of ISP
The same holds true for BOS
. None of the East Coast LCCs fly transborder (Although B6
have been rumored for the future), leaving your options out of BOS
limited to AC
and American Eagle.