Yes pretty much, how are you looking to book?
I'm currently booked ewr-bru-tlv using sq, first segment is on UA. If the first flight is delayed I would try to get them to put me on the later nonstop
There are several different ways to get space that are shareable, fyi 1) book connecting flights on partner airlines and if schedule changes screw your trip, force them to put you on UA metal.2) transfer in points for a phantom LH (or other phantom space) flight then call and cry that you transferred your points for this trip and get them to put you on UA metal
How could you confirm its phantom space without calling?
Check EF and AC.
About to cancel EWR-TLV 77W J for next week
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I find it surprising that UA would do that (though they definitely on occasion do), since they technically can reverse a transfer (though obviously they don't typically).
Could they? sure. They're not obligated to accommodate you.
So then what are you asking.
So you're hoping someone has tried this, found a phantom flight, transferred points, tried to be accommodated, only for the rep to have suggested an alternative award on another carrier as opposed to reversing points transfer? Good luck.
If there is a relatively similar award flight available on another carrier I would assume that they would tell me to book that one instead?