Originally Posted by gmt4

I believe you're reading it all wrong. UA's travel ready center, reopen.eu, and even Belgium's own govt site are all in sync. Here is what you are missing: "This does not apply to passengers with an "Essential Journey Certificate" issued by Belgium or a ‘note verbale’ stating that the country of destination will allow them to enter." Since you are allowed to enter Spain- i.e. 'note verbale' or express permission from the Spanish govt for tourist purposes as an American, onward transit is allowed. If Spain would change and disallow entry to Americans then you'd be out of luck and you could not transit Belgium...because you'd have nowhere to go. And of course that could still happen. Per the Belgian govt transit is considered essential travel and Spain allows entry. I read it as being good to go. For now. One would also assume Belgium's own govt website should be accurate. Barring access to Americans or denying transit would be a huge deal, and would definitely be news posted somewhere.

Is the travel ready center expressly putting up a red triangle saying no-go or is it saying conditional? If conditional, then you meet the conditions. This might warrant a call to UA and have them put you in contact with with the travel ready desk. I believe the desk is staffed until 6PM or so ET. See what they say then make your move from there on whether or not a re-booking is necessary.

I just reviewed the travel ready center for my own trip and I have no such conditions...however I am transiting thru BRU to ORD...leaving the EU.

Again, only taking an interest in this and giving input because of my own transit at BRU later on. I'm going to continue to monitor.