Airlines, hotels and cruise operators serving Latin America and the Caribbean are facing growing concern among travelers spooked by the mosquito-borne Zika virus.
The outbreak of the virus, linked to brain damage in thousands of babies in Brazil, comes as a record percentage of Americans plan a vacation in coming months and a near-record proportion of them look to take advantage of a strong U.S. dollar by going abroad.
The Centers for Disease Control and Prevention warned travelers via Twitter to consider postponing travel to areas with ongoing Zika transmission.
Canada and Chile are the only countries in the Americas the virus is not expected to reach, the World Health Organization (WHO) said on Monday.
United Airlines said it was allowing customers who had reserved tickets for travel to Zika-impacted regions to postpone their trips or obtain refunds with no penalty. And American Airlines said it would give refunds to pregnant women who were planning to travel to parts of Central America.
A spokesman for Delta Air Lines said the carrier was monitoring the situation but not yet offering waivers. JetBlue Airways and Spirit Airlines were not immediately able to say whether they were offering refunds.
Southwest Airlines said it was sticking to its normal policy, which lets customers who cancel ahead of time reuse the value of their tickets. All of those airlines fly to at least some affected locations.
Norwegian Cruise Line Holdings and rival Carnival said they would allow expectant mothers covered by the CDC advisories to reschedule cruises to a later date or switch to an itinerary outside the affected countries.