It is actually not through WJ but WJ Vacations since it is a package. I received in my inbox
For every adult that flies, one child flies FREE† when you book a minimum 5 night vacation package, that includes a 5-day
Disneyland Resort Park Hopper Bonus Ticket for the price of 3!**
Book by May 20, 2010 (11:59 MT) for travel on select dates between May 1 and June 18, 2010, with travel completed by June 23, 2010. Advertised price valid for travel on May 5, 12, 26 and June 2 & 9, 2010. Other departure dates available, prices may be higher. Price is per guest based on double adult occupancy in a standard room. Prices are accurate at time of printing deadline. Taxes, fees and transfers not included. Advance booking required. New bookings only. Offer is limited and subject to availability. Non-refundable, non-combinable and non-transferable. Subject to change without notice. Other restrictions may apply.
†KIDS FLY FREE (KFF) offer valid for travel to Los Angeles when a minimum 5 night vacation package and 5-day DisneylandResort Park Hopper Bonus Ticket are purchased. One child (ages 2–17) flies free per one paying adult (18+ years).
Taxes, fees and surcharges for free airfare are still due and payable by guest. See westjetvacations.com for full details.
**'5-for-3' ticket provides each guest with a 5-day Disneyland Resort Park Hopper Bonus Ticket at the regular price of a 3-day Disneyland Resort Park Hopper Bonus Ticket. Tickets may only be purchased between March 16 and September 1, 2010 and are valid for Theme Park admission from May 1 through September 30, 2010. These Tickets expire 13 days after the first day of use or October 13, 2010, whichever occurs first, and each day of use constitutes one full day of use. Tickets may not be sold or transferred for commercial purposes. Subject to restrictions and change without notice. Offer may not be combined with any other ticket offer, discount or promotion.
†† Magic Morning admission allows admission into selected attractions at a designated DisneylandResort theme park before the park opens to the general public. To enhance the Magic Morning experience, it is strongly recommended that guests arrive at least one hour and 15 minutes prior to regular park opening. Magic Morning admission is based on availability and does not operate daily. Applicable theme park, days and times of operation and all other elements including, but not limited to, operation of attractions, entertainment, stores and restaurants and appearances of characters may vary and are subject to change without notice. Subject to capacity and other restrictions. As to Disney artwork, logos and properties: © Disney.