1) Yes - I can see that - the article does say that medical advice would be given, so I would presume that they would be using an in-airport doctor / medical staff - the check in staff being used to initally spot the symptoms.
2) The mortality rate may be lower, but the transmission rate is higher - i.e. the number of people who catch it, and thereby are removed from the workforce (at a time of global recession, the impact of losing workers even for a week or two can't be underestimated)
In ferrets (the article states that they are a good model for human transmission), the transmission rate for H1N1 was 100% as opposed to 66% for seasonal flu.
http://chealth.canoe.ca/channel_health_news_details.asp?news_id=28420&channel_id=1020
WHO states
Computer modeling based on the early data from Mexico estimates that up to three times as many people may have been infected with influenza A(H1N1) than would have been expected if the outbreak had been caused by seasonal influenza.
http://www.wpro.who.int/media_centre/news/news_20090515.htm
Both of these are studies published a month or so ago - I'm trying to find more recent data, but all I'm getting is panic from the tabloid papers...
3) Unfortunately, whilst airline ventilation system may prevent infection, it's not going to stop someone who is sat in the row behind you, or who walks past you on the way to the toilet, from passing it on to you.
And whilst most of the deaths in the UK have been from people with underlying health issues, again, if someone with a mild heart condition or asthma travels on a plane with someone who has swine flu, catches it and dies, if it can be tracked back to that airline, then the aircompany could be held responsible (yes, stupid I know, but that's US litigation culture for you

)