The absence of a lock is a major, non-trivial design flaw in the MBA.
This problem has been discussed back since the first MBA and every time an updated model is produced these discussions return.
Would all of those who smugly post that the device needs no lock, that locks are useless, please read all the posts that have been floating around the internet for the past two years. Nothing you say has not been said dozens of times already.
If you don't want a lock, fine. By all means buy a MBA and go ahead and take it with you every time you take a wizz, grab a cup off coffee, go out to answer your cell phone, whatever.
And each time you leave, take note the wireless network connection you make is severed and any ssh connections you have becomes lost, because this is the joy of the "solution" you put forth.
Lots of people who do their hard core computing on remote servers are attracted to the MBA because they don't need the direct processing power of a MBP but are dismayed to learn that the MBA is a giant security liability.
