Why is it that when booking an award with UA, you can book, for instance, CDG-EWR-SFO in XN (and the website shows XN availability, like below), is available, but if you want to just fly EWR-SFO in XN, it's not available? Is this new to United's website, or is it always been like this? Basically, you can only book the flight if you are flying CDG-EWR-SFO, or is this something that can be handled over the phone?