Allegedly not no BA, but otehr European carriers are not so stringy when it comes to that, but always at the captain's discretion.

I was able to land at CDG on an A5 (Hop ) flight, the piltos joked this is not allowed as much as it was years ago, not beacuse of 9/11 but because some attractive ladies who were invited in the cockpit would file a harassment complaint after landing.

My best experience was on Air Greenland, an entire flight from start to finish, over the ice cap, on a bright sunny day...truly unforgettable