I've been on each side of the US at one point so I've gone from like Cental to Pacfic, and Central to Atlantic, and then I lived in Colorado which gave me mountain time, and then I flew over Arizona who doesnt' change it's time.
Next year I'll be flying to Dubai, U.A.E. so I'll be crossing over alot 'cause like it's 9:54am Central time and it's 7:54pm what ever time in Dubai.