Other related secondary "shoulds" are to download/SMS/SyncML the itenerary to a cellphone / blackberry / smartphone / PDA, and to insert it into Google Calendar.
When my confirmation is emailed to me, it should have an attachment with the iCal object.
Update: I suggested this to AlaskaAirlines website at the same time I wrote this LJ post. I just got the following email back from them:
Dear Mr. Atwood,
Thank you for your suggestion. We have forwarded your email to the web development team. I have heard that they are looking into this feature.
Customer Care for alaskaair.com