WestJet was to be the Boeing launch customer for the winglets on the 737-600, but announced in their second-quarter 2006 results that they were not going to move ahead with those plans.
WestJet var tänkt att bli Boeings lanseringskund för 737-600 med winglets, men meddelade i sitt andra kvartalsresultat 2006 att man inte skulle gå vidare med dessa planer.