Afterwards? As in, after she died? You're supposed to. When you visit revisit Midgar, the ghost of Aeris is there, kneeling by the flowers. And I'm sure she looks up at Cloud before quickly disappearing again.
When you first meet Aeris, however, a flickering figure of her shows up in the aisle behind her, while you are talking to the actual Aeris who is standing in front of you, on the flowers. The flickering thing is a glitch. Not some... silly... 'Cloud could see what was gonna happen in the future' thing. I actually noticed the flickering thing during my very first game play & knew it was a glitch.





