There is a reason I am not in airline management. How does UAL justify offering fares SEA to FRA for $231 + taxes/fees = $506? Back in February, I purchased that same ticket from CAL for $666 and received credit for the difference when it lowered the fare to $393. It's a slow day at work today so I enjoy checking around and that's when I saw the UAL fare. Must be getting old because I will never understand airline fare structure.