Delta Air Lines has three distinct status to eTickets. Below is a table of the available ticket status codes.

Ticket Status CodeDescription
OPENeTicket has been issued for PNR and available for check-in.
CKINPassenger has checked-in, but has not boarded the flight.
BRDPassenger has boarded, but flight has not departed.
FLWNPassenger has completed the leg of the flight and the eTicket is closed.