Originally Posted by
jerry a. laska
Ah yes - that would explain it. Should perhaps have traded in for two one-ways then as I'm probably now stuck on original return segment

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Original LHR-GLA-LCY did mention FCOD in benefits when confirming booking, and I think I've used in on that routing previously. Is ex-/in-LON a known exception to "no open jaw", which I think can be used (correctly or otherwise) to mean different "home" airports or land segment at "destination end"? I'm aware that FCOD does not allow shifting between LON airports.