Seatseller, unless you are a commercial pilot under U.S. FAR 121 or 135, U.S. regulations prohibit "in flight" visits to the flight deck. The rules are different for U.S. Flag Carriers. In the U.S., "jumpseating" means you actually become a member of the crew of the respective flight. I am assuming you are referring to American Airlines flt #51. But, please do get a visit prior to engine start.
Check 6
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Kick the tires, light the fires, first off is lead, brief on guard.