Airlines rushed to schedule dozens of additional flights on Sunday to accommodate tens of thousands of travelers stranded across the Eastern Caribbean, following the expiration of the United States flight restrictions in the region.

The U.S. Federal Aviation Administration’s had temporarily closed the airspace to commercial flights after U.S. strikes in Venezuela the previous day.

The restrictions had led to the cancellation of hundreds of flights on Saturday, leaving passengers stranded at the close of the busy holiday season.

FlightAware reported around 20 flight cancellations in San Juan on Sunday, down sharply from 400 the previous day.

However, some travelers may face disruptions for days, as seats remained limited and flights were already full due to the New Year holiday weekend and school breaks.

On X, airlines received complaints from passengers who said they couldn’t secure seats back to the U.S. until the end of the week.

Many also reported having no accommodations or being unable to afford extra nights at Caribbean hotels.

American Airlines said it added 17 extra flights connecting San Juan, Puerto Rico, with destinations including Aruba, the U.S. and British Virgin Islands, Antigua, Barbados, Dominica, and its hubs in Miami and Charlotte, North Carolina, according to CNBC.

Southwest Airlines added six extra round-trips from San Juan on Sunday, another eight on Monday, and two additional flights to Aruba on Sunday.

“We are looking for opportunities to add more capacity to both places in the coming days,” the airline said in a statement.

By Sunday morning, even the newly added flights were showing as fully booked on airline websites, as seats were snapped up quickly amid the surge in demand.

United Airlines and Delta Air Lines also announced plans to add extra flights on Sunday.

Airlines were considering deploying larger aircraft, typically used for Europe or Asia routes, to handle the surge in passenger demand.