Ok, their tech staff won’t exactly be taking the week off. No doubt they’ll be working some overtime, overhauling the back end of their systems. But the upshot is that effective April 14, 2008 Alaska Airlines Mileage Plan will be completely unavailable and will come back online no later than April 22, 2008.

During the outage it will not be possible to book or change award tickets, request a mileage upgrade, or any number of other things (fully detailed on this page).

This won’t affect the ability to earn miles, they just won’t appear in your account until the system is back online.

Here’s hoping it goes smoothly! And if you need to request upgrades or book an award ticket, better do it prior to April 14.