Originally Posted by
canadiancow
TK is green, because there has been a schedule change, but nothing is cancelled, it can be flown as is, or you can acknowledge it to move it to HK.
Data point:
I have a case of TK, green. But no option to "accept" on aircanada.com. This is an Aeroplan reward. Just a message saying "There has been a change to your booking and it is not possible to check in for your flight at this time." Mind you, kind of funny because they can't check in online in any case, since the passengers are a child and an unaccompanied minor. Grandkids.
Change is merely from a 789 to a 333, with same departure time, but later arrival by 13 minutes.