Currently Being ModeratedApr 20, 2013 1:15 PM (in response to Eriq)
I am guessing you are referring to photos that were already placed in Photo Stream by some other device. I assume you're trying to see those photos using your MacBook Air's iPhoto app, and they are not there.
Are you using the current version of iPhoto (9.4.3)?
Have you checked iPhoto's Preferences > Photo Stream to make sure all boxes are checked?
Currently Being ModeratedApr 20, 2013 6:35 PM (in response to Eriq)