I asked on the plane when Fajr starts and was told it had started. I waited 10–15 min to be sure because it looked dark outside but didn’t realise the windows were shut. After praying, I saw orange line with a fade outside. Now I’m unsure if I prayed on time. Should I repeat it? Did I miss the time?

Ustadh AbdulAziz al-Haqqan

I believe you told me about waswas happening to you therefore the answer is always don't repeat.