New answers tagged british-airways
British Airways was asked (admittedly a while back), and while they don't ban it, they did say it was: "not something we would actively encourage" (source) I haven't seen a more recent source yet :/
The relevant threshold is 24 hours, as documented in point 2.5 and 2.6 of this document [PDF]. As you probably know, there are also other conditions, depending on your citizenship but travelling to the US with a US visa, it seems you fulfill them. Your friend might have needed a visa for one of these other reasons. See Is there a way to find out if I need a ...
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