Air travel data graph

Maria wants to use an airplane ticket to gain access to a boarding area in an airport. She goes through a checkin process that derives a boarding pass from her ticket. The boarding pass contains data directly attested by the carrier (from the ticket), as well as data attested by the passport that Maria used during check in, plus data attested by the credit card company that Maria used to buy the ticket.

Maria uses her boarding pass to go through a security checkpoint. This adds data to her boarding pass (or to a new piece of data that she can use in association with her boarding pass).

When Maria arrives at the gate, all of this data can be verified. Verification should impute different trust to different fields on the ticket depending on the provenance of the data.

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