I have a fully-ticketed RT US-SIN-PEN where the SIN-PEN segments are operated by Silkair (MI) and all others by United. When I look at the reservation on the UA website I don't see an "upgrade flights/redeem upgrade" option. I'm curious whether this is because of the SIN-PEN segments on MI, or if something more sinister is at work here. I'm not too worried about it as there's no R space available right now when I do searches by segment, but it does seem a little odd. Is this normal with non-*A segments in a reservation?
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