Interisland
ahd-5
adjective.
Relating to, involving, or connecting two or more islands.
The Century Dictionary and Cyclopedia
Between islands; belonging in common to several islands.
Wiktionary, Creative Commons Attribution/Share-Alike License
adjective.
Between
islands
.
Word Usage
"But Mokulele last month announced it would expand its interisland service through a venture with Indianapolis-based Republic Airways."
Same Context
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outward-bound