Flight Crews use Game Center to tally your delivery totals. The "Jobs By You" and leaderboard counts will be delayed as they have to be sent to our server through your Game Center account before they will show up as counted. This is only done periodically and only while you are in the app. Once they make it to our servers it may take up to an hour for the rank to make it back to your device.
If you are playing Pocket Planes offline, you need to login to Game Center from the Pocket Planes app BEFORE the event ends for your deliveries to count.
Also, if you load up a plane with jobs to the event city and then close the app and don't open it again (while logged into Game Center) until after the event ends, those jobs will not be counted towards your Flight Crew totals.