Celebrity's Summit, Infinity and Mercury will sail in Alaska from May to September in 2007; the line is accepting bookings now. Following a 13-night West Coast and Alaska voyage departing San Francisco and concluding in Vancouver, Celebrity's Infinity will reprise its seven-night Hubbard Glacier cruises roundtrip from Vancouver, British Columbia, on Sundays, May 20 through Sept. 9, 2007. Infinity will also visit Ketchikan, Juneau and Icy Strait Point, AK and conclude its 2007 Alaska season with a 13-night voyage departing Vancouver on Sept. 6, ending in San Francisco, with ports of call in Sitka, Juneau, Skagway, Ketchikan and Icy Strait Point, AK. Celebrity's Summit sails from Los Angeles on May 12, 2007, on a 13-night cruise ending in Vancouver, where the ship resumes its seven-night Northbound Alaska cruises on alternating Fridays May 25 through Aug. 31, 2007. The ship's seven-night Southbound Alaska cruises will depart from Seward, AK, on alternating Fridays. Ports of call on both itineraries include Juneau, Skagway, Icy Strait Point and Ketchikan, AK, along with a cruise through the Inside Passage and beside Hubbard Glacier. Summit will wrap up its 2007 Alaska season with a 14-night "Ultimate Alaska" voyage departing Vancouver Sept. 14, ending in San Diego, CA. Mercury launches its 2007 Alaska season with a seven-night Hubbard Glacier cruise departing Vancouver May 4. Ports of call include Juneau, Skagway and Ketchikan, AK, along with Hubbard Glacier and a cruise through the Inside Passage, ending in Seattle. Then Mercury will depart roundtrip on seven-night Hubbard Glacier cruises roundtrip from Seattle between May 11 and Sept. 14, 2007, visiting Hubbard Glacier, Juneau, Skagway and Ketchikan.