Celebrity Cruises announced it will change the ship sailing summer cruises from St. Maarten.

An email sent to travel agents on Thursday indicated Celebrity Millennium will be swapped out for July and August sailings with Celebrity Summit.

This change does not affect the first sailings on Celebrity Millennium beginning this weekend.

Why the change? The recent bill which was signed into U.S. law to allow cruise ships to visit Alaska this year is the reason.

According to Celebrity, the legislation inadvertently listed the Celebrity Cruises ships originally scheduled to sail in Alaska, which did not include Celebrity Summit.

The Alaska Tourism Restoration Act specifically listed all the ships the new law applies to, and sure enough, Millennium is listed, but not Summit.

As a result, Summit would not legally be able to sail to Alaska this year without visiting Canada.

After evaluating the situation, Celebrity decided that in order to comply with the new law, Celebrity Millennium must sail roundtrip from Seattle in Alaska.

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