Launch Services Alliance is a partneship between several space companies to offer launch services.
It was created in July 2003: Arianespace joined with Boeing Launch Services and Mitsubishi Heavy Industries to create the Launch Services Alliance. The flagship launchers for the Launch Services Alliance are Arianespace's Ariane rocket, Boeing's Sea Launch platform and Mitsubishi's H-II A vehicle.
The agreement enables customers to seamlessly transition among three private spaceflight platforms for maximum flexibility to ensure delivery to orbit while allowing the Alliance's three members to retain their marketing autonomy. The arrangement is roughly comparable to the airline industry's "code sharing" agreements.