Airlines constantly tweak their schedules, trying to find profitable new routes or pulling the plug on ones that have underperformed. Airports and communities court these new services.

There are dozens of changes to airline routes each month. Here’s a look at some of the most interesting:

The sunny South Pacific, non-stop via San Francisco

Those dreaming of a vacation to the South Pacific are getting a new option to fly non-stop from the mainland United States.

United Airlines is turning to Tahiti for its latest overseas route, part of a robust international expansion by the carrier in 2017.

Full report: United Airlines will fly to Tahiti

So long, Queen of the Skies: United’s Boeing 747 farewell flight was one to remember

United will begin flying to the South Pacific island Oct. 30. The airline will offer three flights a week between its San Francisco hub and Papeete, the capital of the French Polynesia territory that includes Tahiti. United will use Boeing 787 “Dreamliner” jets for the flights, which will take about eight hours. The seasonal service is scheduled to run through March 28.

The Tahiti flights continue what has been a torrid international expansion for United during the past year. The carrier launched 13 new international routes, including to new destinations in Reykjavik, Iceland, and Porto, Portugal.

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Norwegian Air expansion spree

Norwegian Air is at it again, announcing four new U.S. routes in the latest expansion for a carrier that already billed itself as the “world’s fastest-growing airline.”

The low-cost carrier will add three new European destinations to its U.S. lineup: Amsterdam, Madrid and Milan.

Full report: Norwegian adds four new Europe routes; fares from $199 one way

The service also will expand Norwegian’s presence in the USA’s two biggest cities. From…