Porter now has an interline agreement with SIA for flights to SIN via EWR. I'm really curious why they're bothering to do this, considering SIA is dropping their EWR route later this year.

http://www.huffingtonpost.ca/2013/01...n_2567754.html

SIA does still keep their route from JFK (via FRA) but I doubt they'll be interlining luggage between EWR and JFK, so I'm not sure what the benefit would be to either airline after the EWR route is gone.