Both are pretty much the same. Minor differences, somewhat related to the fact that the operating airline has taken control of the ticket in order to start preparing the flight. The possible codes are:
Code:
The status of the coupons can be any of the following:
A AIRPORT CONTROL O OPEN FOR USE
C CHECKED IN N NOT SHOWING FINAL STATUS
P PRINTED E EXCHANGED/REISSUED
R REFUNDED F FLOWN/USED
S SUSPENDED U UNAVAILABLE
G CONVERTED TO FIM T PAPER TICKET
I IRREGULAR OPERATIONS V VOID
L LIFTED/BOARDED X PRINT EXCHANGE
Z CLOSED Y REFUND TAXES/FEES.
In A & O status the issuing office can still intervene and reissue, when its on C, E, S, I you have to contact the operating carrier.