From The GAO:
"Did the Transportation Security Administration (TSA) follow its procedures to ensure the security of U.S.-bound aircraft from Cuba?
TSA generally followed its security procedures for airport assessments and air carrier inspections in Cuba in fiscal years 2012 through 2017. However, TSA did not inspect all the required aircraft from Cuba in the established time frames, in part because TSA was not able to identify or reliably track U.S.-bound public charter flights from Cuba.
We recommended that TSA develop a tool to reliably track air carriers' public charter operations between the U.S. and Cuba.
Transportation Security Administration inspectors prepare to inspect an aircraft at Frank Pais Airport in Holguin, Cuba"