So X-Men United along with the first Fast and Furious are not pan and scan in the traditional sense but rather sort of a hybrid between open matte and pan and scan >
Yes, because the most common way of getting 4:3 out of Super 35 films is using the full framing it was shot in (usually 1.78 or 1.66:1, though some are full 1.37 Academy) then side cropping to 4:3. VFX can vary from getting the same treatment if done on the full S35 ratio (True Lies and SM2 are examples), or being P&S if they were animated/matted to OAR during production. Most HDTV airings of the F&F films are open matte (though some shots or VFX on the later ones like Fast and Furious may be cropped).