WASHINGTON, Nov 11 (Reuters) - Cuba has agreed for the first time since the pandemic to accept U.S. deportation flights carrying Cubans caught at the U.S.-Mexico border, three U.S. officials told Reuters, giving U.S. authorities a new but limited tool to deter record numbers of Cuban border crossers.The U.S. agency is waiting until it has enough Cuban deportees to fill a plane before sending one to Havana, they said.Regular deportations of Cubans were halted during the COVID-19 pandemic, though the United States continued to deport a small number of Cubans via commercial airlines, a separate U.S. official told Reuters.About 1,500 Cubans were removed in fiscal year 2020, which began on Oct. 1, 2019, the year regular deportation flights were paused, according to data from the U.S. Department of Homeland Security.Top U.S. immigration officials visited Havana this week - the highest-level U.S. visit since the historic rapprochement under former President Obama - as the migration crisis worsens."