Originally Posted by
flyerCO
It allowed me to rebook both outbound and return despite return having no change.
Are you sure there was ZERO change? IME, any change can trigger this:
Flight number change (even if times are generally the same)
Carrier change (personally, Ive been having a lot of OO vs ZW)
Aircraft change (a couple here I've had changes on 00 flights of getting a CRJ200 vs E175)
YMMV