The problem with a plane...
Why...
Are smells allowed free access to an aircraft cabin? There is a type of traveler that needs to be severely dealt with. Sorry, but if you have Body Odour that whips me, I ain't sitting next to you on a ten hour flight. In the same way they run those portable metal detectors round your body, they should have one of those electronic smell detectors they have on CSI. If you rate 4 noses or above on the sniffometer...unless you have a shower, you can't get on board. Then there is the 'What did you have to eat' interrogation. If you had a curry, baked beans or Brussels sprouts (with resultant imminent ass-coughs) you should also be forced to wait until you have fully digested the meal.