If using a computer on the drop down tray while squashed into the middle seat of the seat row that doesn't recline at the back of cattle class, is your desire, then I think you should have gotten a MBA 11". At least then using that computer would allow you to have a high resolution camera for FaceTime instead of the low resolution pixelated one in the rMB.
The MB is smaller, lighter, with a larger screen, better screen resolution, wider keyboard, and larger trackpad. What's the problem with it on a plane? It seems like the perfect computer for it. In cattle class, I usually try and choose aisle seats, exit rows, and so forth, but a middle seat would not be a problem with the MB. I'm not sure how in the world an 11" would be better on the plane. Don't get me wrong -- I've taken the 11" on a plane before, and it is fine, but the MB is really quite nice (for the reasons above).
Yeah. The camera is not especially thrilling, as is often the case in Apple devices (early iPads, iPods, etc.), but it isn't awful either. They seem to get a generation or two behind for some reason, while the latest iPhone is the only exciting thing in the lineup. But, I can see my family clearer on the MB, and the resolution isn't so terrible that my family is going to wish 11" on me or anything, so the tradeoff (lower quality on their end / higher quality on mine) seems fair to me.
As for the TSA and airport security around the world, they have a job to do, and I try to help them out as much as I can by taking out all of my electronics. It makes things go faster, even if I could "technically" keep the iPad or Kindle in my bag. I really don't want to go through the extra screening anywhere.
As I recall, Hong Kong security was a little confusing (I read Chinese, but still had to ask about the last turn in the hallway to get into it on a connecting flight a few months back), but besides that, no worries -- they didn't bat an eye at the MB. In the business lounge, I remember a lot of PCs, but that might be because folks are using work computers or something. I rarely see MBs in the wild, surprisingly, though I expect we'll see more of them as word spreads and the not-so-great reviews get forgotten, especially in the second generation, when folks feel more comfortable purchasing it.