Yes, you need to be careful with the WEB quotes. I was looking at PHX-->GDL a few weeks ago. The site quoted $620, so I was going to use miles. But the web site kept erroring out. So I called, and I guess forgot to tell the rep that I wanted to use miles. When the rep quoted $375, of course I booked that rather than using miles. I wonder how many people have been 'screwed' by booking thru the web site, rather than talking to a rep and getting the true lowest price???