I know I've mentioned that this feature was coming for about a year now, but I've finally been able to test it and make sure that it lives up to the reputation I've worked so hard to create for ISSTracker.
I find people usually only have an approximate time they think they might have seen the ISS, so for those who may like to know, the flight path is set to start showing where the ISS was 31 minutes in the past and just about 1 full orbit (91 minutes) in the future, relative to the time you entered.
With that said I really hope you will all enjoy this feature. It's still in beta so if you have difficulty using it, please feel free to let me know so I can fix it and make it perfect.
-Mike