United told me they no longer require your passport number for the boarding pass due to security reasons. you just show your passport with your boarding pass. I still can change my global entry number though in "my account" on United but they no longer want your passport number. Of course I will double check that once we get the new passports because I never take one person's word for it.
Great, I'll renew our passports in January, that gives us plenty of time.