Originally Posted by
airchick
Having a note about other PNR(s) in your PNR [or having them linked in some way, not sure how it is actually done] is nice in the event of flight cancellations/weather/etc.
I'd agree if you replace "nice" with "practically useless". Twice, it didn't prevent them from rebooking me and my wife on separate flights, so we just don't bother any more.