UPDATE 2-US travel companies suspend operations in Haiti

* Airlines unsure when service to Haiti will resume

* UPS, FedEx holding deliveries

* Royal Caribbean says Labadee appears undamaged (Adds logistics companies)

NEW YORK, Jan 13 (Reuters) - U.S. airlines and package-delivery companies suspended service to and from Haiti following a 7.0 magnitude earthquake on Tuesday that may have killed thousands of people.

Delta Air Lines Inc DAL.N, the world's largest air carrier, canceled its flight from New York's John F Kennedy International Airport to Port-au-Prince, Haiti's capital, company spokesman Anthony Black said on Wednesday.

AMR Corp's AMR.N American Airlines flew its last flight from Haiti to Miami Tuesday night around 6:45 p.m. EST (2345 GMT), spokesman Tim Smith said.

Both carriers said they were uncertain when flights to Haiti would resume.

Logistics companies United Parcel Service Inc UPS.N and FedEx Corp FDX.N confirmed their operations in Haiti were halted until the airport reopened to commercial traffic.

“We are holding our customers’ shipments in Miami until we can resume operations,” said Sally Davenport, a spokeswoman for FedEx.

Norman Black, a spokesman for UPS, said his company was also holding deliveries until it could resume flights into Haiti.

“We’re not sure exactly when that’s going to be with the status of the airport there,” Black said.

Both companies also said they are working with international relief agencies to help transport supplies into the disaster zone.

The earthquake’s epicenter was 10 miles from Port-au-Prince. Aftershocks as powerful as 5.9 rattled the city Tuesday night and Wednesday. About 4 million people live in the city and the surrounding area. For details on the earthquake, please see [ID:nN13137542]

For a map of Haiti locating the epicenter of the earthquake, see here.

Meanwhile, cruise operators had quiet Haitian operations on Wednesday.

Royal Caribbean Cruises Ltd RCL.NRCL.OL said its private beach destination in Labadee, Haiti, reported no apparent damage to the company's buildings, pier and attractions. It added that all of its workers in Labadee were accounted for and had no injuries.

No Royal Caribbean ships are set to call on Labadee on Wednesday. The company’s Independence of the Seas cruise ship is scheduled to go to Haiti Friday. Three other ships are slated to stop in Haiti next week.

Carnival Corp CCL.NCCL.L, the world's largest cruise operator, said it does not have any cruise ships scheduled to stop in Haiti and added there were no changes to its schedule.

JetBlue Airways Corp JBLU.O said it would waive change fees and fare differences to allow customers to rebook their travel to the Dominican Republic, which shares the island of Hispaniola with Haiti.

The U.S. State Department urged Americans not to travel to Haiti.

U.S. airline stocks were higher on Wednesday as oil prices fell after an industry report showed jumps in stocks of refined products. The Arca Airline index .XAL up 3 percent in afternoon trading.

Royal Caribbean shares were up 3.2 percent to $26.49. UPS was off 26 cents to $62.14, and FedEx was off 1 percent to $85.70. (Reporting by Deepa Seetharaman in New York, Scott Malone in Boston, Kyle Peterson in Chicago and Karen Jacobs in Atlanta. Editing by Gerald E. McCormick and Robert MacMillan)