justinbrett
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It used to be available across most if not all of the OW network even when it was not (opinion) a OW requirement of its members. That alone made it very beneficial to fly within a network. To me other benefits are not as compelling apart from SC/FF harvesting.
Interlining on separate PNRs used to be part of the minimum standards of oneworld.
This was changed in 2016. They were obligated to do so before then.