[paranewbi]

No… you can purchase your flight ticket at any Mexican airlines, just print out your ticket and bring it with you (usually you can print out your boarding pass 2hrs in advance and that is sufficient at CBX). That way you get to walk past the crowded airline counters within the CBX facility that others are getting their ticket/boarding pass at (Don’t get in any lines within CBX just go to the entrance to crossing where agents are standing to review your documents detailed out in the above).

I also go on the CBX website to purchase my CBX crossing pass… a lot of the airlines offer to complete this with your flight purchase but will get you for a few bucks for the pleasure.