I have had all my panic attacks accompanied by flashbacks. A panic attack for me is basically just crying and shortness of breath, being terrified etc. The only thing that triggers a panic attack for me is a flashback. My flashbacks only occur in the same place as the trauma or when something reminds me of the danger that occurred in the event. I would say you can 100% have a panic attack with a flashback, even though I feel like flashbacks are different for every person. For me it is seeing something and thinking it is something else, or feeling like your at the place of the trauma again. I am only speaking from personal experience, but that's just me.