Hope I'm posting in the right forum and apologies if i'm not !!....Currently on a DONE4 issued by AA with the last leg being MEL-HND with QF....overnighting in HND and the following day beginning another DONE4 issued by AA with the first sector being HND-LHR on BA6....my question is if QF cancel the last leg for any reason presumably going tech and i'm delayed by a day am I protected on my first flight with BA ?...Have been doing this for many many years without any issues thinking that having an overnight is sufficient time but now wondering do I need to build in an extra day ?...Thanks in advance for any assistance...Cheers