Both teams played (or play) at the SAP Center (San Jose Arena). Probably, the 747 tail advert was a deal-clincher, goodwill/promotion gesture or both. It makes a lot of sense to drive/cross-promote advertising, sponsorships and other business into a common ecosystem.
As it happens, I used to hang out with the Sabercats and (now former) Saberkittens at (undisclosed) because of a Stanford hookup. Since I don't find drinking fun anymore, I'm old and boring now. :)