Frontier adds 2 more intra-Caribbean routes from fast-growing Puerto Rico base Frontier Airlines is getting set to launch two new intra-Caribbean routes this summer as part of a significant scaling up of its service from San Juan, Puerto Rico. Between mid-June and early July, the Denver-based ultra-low-cost carrier will launch new nonstop service from Luis Muñoz Marín International Airport (SJU) to Cibao International Airport (STI) in …
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