SANTO DOMINGO. – A 6-passenger private jet disappeared 8:10 p.m. Monday four miles after takeoff from the Las Americas International Airport, newspaper Diario Libre reports
Only the pilot and one passenger were aboard the U.S.-registry airplane when it headed to Isla Grande, Puerto Rico, said Airports Department director Andres Vanderhorst.
He said the jet disappeared from the airport’s radar, which prompted Dominican Air Force planes and helicopters to search the Caribbean waters.
Sources Diario Libre, Clave Digital

For example John Travolta had his 737 remodified in order that he could fly it byhimself.
Copilts are required on the complexity of the aircraft and if you are carriying passengers for hire.
We have been getting different info all day. But it was just one pilot. Now they say they may have located the wreckage near Aquadilla , PR.
So, how did a jet fly from SDQ to BQN, (aguadilla) no radio contact and no one called RADAR etc. to see if it was a drug runner etc. The system is only as good as those working it. So just watch nothing change with planes and radar in DR.