You can buy tickets in Advance if the Showtimes are already posted. Some theaters don't post showtimes until Wednesday if the movie is released Friday. At that time, you can select your seats and buy in advance plus pay a concenience fee of like $1-$2 per ticket. It's work it to me just to skip the lines when you arrive. Just go inside, show barcode in email, scan, and thats it.
You can purchase tickets in advance online.
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