Premise: Air Caribbean was an airline that served from Luis Muñoz Marín International Airport, then "Isla Verde International Airport", in San Juan. The 1970s and 1980s were decades when several Puerto Rican airlines existed and competed against each other, including Prinair, Vieques Air Link and Dorado Wings. Believing a share of the market profits could be gained, Air Caribbean was created in 1975.
Hypothesis: There was more than one Puerto Rican airline in the 1970s.