It sounds ridiculous,Why not tell passengers to do the following;
1. Drink a bottle of water during flight (0.5litre) cost= 50pence. If the airlines are so concerened for passenger safety, maybe they will give water for free...now thats a radical thought!!
2. Take an aspirin before flight...thins the blood reducing DVT.
3. Dont get smashed before/during flight.
4. WALK.
As usual, lots of sensational noise from media, we are all going to die if we step foot near an aircraft.