Well, they recently updated, so I guess it doesn't really count, but airliners.net/ used to have an awful experience with discussion threads 100s of comments long that you could only reveal 10 at a time. The community on the site is amazing, though. For a long time it was pay-access only to post on comment threads, so only pilots, FAs, mechanics, and others directly involved in the airline industry would post there. It's still my go-to for anything airline related.
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