Other small-ship operators include American Cruise Lines, sailing in Alaska for the first time this year with its American Spirit. Alaska Dream Cruises is adding a third ship, the Baranof Dream, to join its Alaskan Dream and Admiralty Dream in its fleet. Lindblad Cruises has two ships, the National Geographic Sea Bird and National Geographic Sea Lion; and Glacier Bay Cruising has three vessels, the Wilderness Adventurer, Wilderness Discoverer and the Executive Explorer. All carry less than 100 passengers.

Here’s a summary of major ship sailings this season:

•  Carnival: Mostly seven-night roundtrip sailings from Seattle on the Carnival Miracle, which is replacing the Carnival Spirit this year.

•  Celebrity: Seven-night cruises on three ships — Celebrity Solstice will sail from Seattle; Celebrity Century from Vancouver; Celebrity Millennium between Vancouver and Seward.

•  Crystal: One nine-night cruise only.

•  Disney: Fifteen seven-night cruises on the Disney Wonder from Vancouver.

•  Holland America: Seven ships will make seven-night cruises from various ports — Amsterdam, Zuiderdam and Volendam from Vancouver, Oosterdam and Westerdam from Seattle, Statendam and Zaandam between Seward and Vancouver.

•  Norwegian: The line’s addition to its Alaska fleet, the Norwegian Sun, will make seven-night cruises between Vancouver and Whittier. The Norwegian Jewel and Norwegian Pearl both sail from Seattle.

•  Oceania: Returning to Alaska this year, the Regatta will make seven-, 10- and 14-night sailings, mostly between Vancouver and Seattle, with some roundtrips from Vancouver.

•  Princess: The line will have 124 Alaska sailings on seven ships this year — Grand Princess from San Francisco; Diamond, Sapphire, Island and Coral Princess ships between Vancouver and Whittier; Golden and Star from Seattle; Island and Sapphire also make one roundtrip each from Vancouver.

•  Regent: Seven Seas Navigator will sail mostly seven-nighters between Vancouver and Seward.

•  Royal Caribbean: Rhapsody of the Seas will operate seven-night cruises out of Seattle, Radiance of the Seas will sail seven nights between Vancouver and Seward.

•  Silversea: Silver Shadow will make 15 Alaska cruises, mostly seven nights between Vancouver and Seward.