WestJet didn't offer any detail on what kind of information was in the profile data or exactly how many rewards members may be affected by the breach. "The privacy and protection of our guests' information is a matter we take very seriously and we have worked swiftly and aggressively to resolve this incident," Craig Maccubbin, WestJet executive vice-president and chief information officer, said in the statement. "WestJet is in the process of contacting affected guests and we deeply regret any inconvenience this may cause."