Quote from another site..
"The individual who did this was given a 'package' from Air Canada when he left. A few company travel passes every year. To book flights on a company pass, you have to use the online booking system. So AC gave him a username and password to the Personal Travel Booking Website.
243,630 hits over a 10 month period. Approx 300 days in this time span, this equates to around 800 hits per day.
Guess how many flights Air Canada has per day? Thats right!
The computer program was checking AC loads, for each flight, everyday!
Makes it easy to bail from routes that aren't being filled by the competitor (which isn't allowed to abandon cities!), and pick up routes that AC is filling their planes on."