DALLAS — With the longer-range Boeing 737-800 on the way, Southwest Airlines, one of the world’s most successful low-cost carriers, is looking at expanding to up to 50 new destinations including Canada.

Other possible destinations include Hawaii, Alaska, Central America and the northern regions of South America.

Southwest CEO Gary Kelly didn’t set out a timetable and told analysts last week that “whether we ultimately serve all 50 destinations is not guaranteed or committed to”.

One thing that might deter Southwest is the high cost of flying from Canada. Five million Canadians cross the border each year because the taxes and fees on flying are so much lower in the U.S.