We are a family of four traveling on paid V class tickets to London Heathrow on Monday afternoon in economy class for vacation, using four Global Premier Upgrade certificates. When I last checked there were enough Business Class seats, but it is too early to check the online waitlist.

QUESTION: Should I split the itinerary or not?
We would like to either upgrade 0, 2, or all 4 people, so as not to leave one person alone.

I am 1K and currently my three United general family members appear to be benefiting from my 1K benefits (free 1st and 2nd bags, Economy Plus seating etc). From reading the forums I think I understand the two main risks with a split, namely : a) n (1..4) get upgraded leaving the rest behind in Economy Plus, b) n (1..4) get different flight re-routing in the event of issues, or c) no-one gets upgraded because 4 upgrades are not available. This was booked as one itinerary, although when I look at the receipt there are four eTicket numbers. Each family members general MileagePlus member number is on their ticket.

What am I not considering? I know I can also discuss this with the gate staff, but that will only work if my connecting incoming flight arrives on time giving me the opportunity to discuss hte international upgrades. Thanks