Cruise lines have been busy in recent days announcing their long-awaited return to sailing from U.S. ports in the wake of the COVID-19 pandemic. With CDC-approved test sailings and some revenue cruises having already been given the green light, here's a look at what some of the major cruise lines have scheduled ahead of the summer season.

Bahamas Paradise Cruise Line was recently approved to conduct a simulated sailing aboard the Grand Classica from Palm Beach, Florida to Grand Bahama Island on June 25-27. If successful, the cruise line said it expects to receive the go-ahead to restart regular cruising on July 2.

Carnival Cruise Line currently plans to resume operations from Galveston, Texas in July, but all passengers will need to be fully vaccinated. Carnival Vista is scheduled to resume service from Galveston on July 3, with Carnival Breeze making its return on July 15. Carnival is also targeting a July restart out of Miami aboard Carnival Horizon. "Carnival continues to work with both the State of Florida and the CDC for Carnival Horizon sailings and plans to provide an update by Friday concerning protocols specific to these sailings to all booked guests," the cruise line stated on Monday. Carnival will issue updates on its plans for August sailings over the coming days.

While Disney Cruise Line has been approved to sail a simulation cruise aboard Disney Dream on June 29, all of the line's U.S. departures are currently suspended. Disney Wonder cruises have been canceled through July 12, 2021; Disney Dream through July 31, 2021; and the Disney Fantasy through July 31, 2021.

MSC Cruises plans to kick off its summer restart with MSC Meraviglia sailing three- and four-night cruises from Miami to the Bahamas starting August 2. The itineraries will feature MSC Cruises' exclusive new private island destination, Ocean Cay MSC Marine Reserve. On September 18, MSC Meraviglia will add seven-night voyages from Miami to the Bahamas and Caribbean while MSC Divina is scheduled to resume cruising from Orlando via Port Canaveral on September 16. The ship will operate three-, four- and seven-night sailings to the Bahamas and Caribbean, making stops at Ocean Cay MSC Marine Reserve.

Norwegian Cruise Line's Norwegian Gem is scheduled to sail seven-day itineraries from Miami to the Caribbean beginning August 15. Norwegian Breakaway will embark on Bermuda voyages from New York starting September 26; Norwegian Bliss will sail the Mexican Riviera from Los Angeles beginning October 24, and Norwegian Escape is scheduled to sail the Caribbean out of Port Canaveral, Florida starting November 13.

Royal Caribbean International will sail six ships from ports in Florida and Texas and a pair of vessels from Seattle to Alaska this summer. Freedom of the Seas will set sail from Miami to Perfect Day at CocoCay in the Bahamas on July 2 while Odyssey of the Seas will embark on six- and eight-night Southern and Western Caribbean cruises from Fort Lauderdale beginning July 3. Serenade of the Seas is scheduled to offer seven-night Alaska sailings from Seattle starting July 19. In August, Allure of the Seas will begin sailing seven-night Eastern and Western Caribbean itineraries from Port Canaveral (August 8), and Ovation of the Seas will embark on seven-night Alaska itineraries from Seattle (August 13). Symphony of the Seas will sail seven-night Eastern and Western Caribbean voyages from Miami beginning August 14. Finally, Independence of the Seas will embark on seven-night Western Caribbean itineraries from Galveston, Texas starting August 15, and Mariner of the Seas will begin operating three- and four-night Bahamas and Perfect Day at CocoCay sailings from Port Canaveral beginning August 23.

Silversea Cruises is planning to sail to Alaska from Seattle this summer. The Silver Muse is scheduled to begin 10- and 11-day roundtrip itineraries from the Emerald City on July 29. Sawyer Glacier, Mendenhall Glacier, Ketchikan, Juneau, Wrangell, Skagway and Sitka will be among the many highlights.