1. You get what you pay for. To lug around the extra weight and sell yourself the concept that it's more powerful is up to you.
2. So while you're waiting on your MacBook "PRO" to boot up, open apps, open files and etc for the next year, with your SLOW HDD, MBA owners with SSD will already be working or playing on their Air.
3. The MBA can get 5+ hours of battery with wifi and BT turned off and they're definitely not needed on an airplane anyways. Secondly, they sell power adapters for $29 that can be plugged into about 95% of airplanes especially by planes that fly those routes. I would definitely prefer less weight not more when traveling.
You can talk about how great your "Pro" is but don't oversell the capabilities or necessity to have those capabilities. We all have our preferences, and it's fine that you prefer the "Pro." I just question the capabilities as a necessity. Just say you prefer the Pro rather than trying to make others believe they need the Pro for any of those three lame reasons you have cited.
The Power is not really the issue. I am the first to admit that the Macbook Air has all the power I really need.
I've always appreciated the weight of the Macbook Air, but in my travel bag, the macbook pro plus power is just slightly more than my old macbook air, ethernet dongle, power, and external hard drive.
2. Particularly with Snow Leopard the startup and shutdown times are pretty negligible. Since the upgrade, I have yet to say "Why won't this boot faster."
3. Maybe 5% of the fleet that flies transatlantically, particularly directly from the Europe to the West Coast have inflight power in economy. And trust me, the direct flight from AMS-SFO NEVER has inflight power in economy. If I had inflight power, my boss could buy me a couple macbook airs for each trip. Let's be realistic on this front.
The truth is there are less and less compelling reasons to get a Macbook Air.
When it was first introduced, it was the only aluminum 13" notebook. It also saved 2 lbs. of weight.
When it was refreshed in October 2008, it competed with the new aluminum 13" Macbook. The vastly superior display was a compelling reason to go Air.
When WWDC 2009 happened, despite the price cuts, a 13" aluminum machine with a great display, great I/O, and a great price was introduced.
The Macbook Air is a great machine, but the 13" Macbook Pro is a superior machine, not just by specs, but by usability.
let's not exaggerate the importance of the SSD in the Air or underestimate the vastly superior battery in the Pro.