After my daughter's wreck, I signed us up for Air Evac. It's only $50 a year for the family and if she had had to be flown all the way to Columbia, it would have cost us about $25,000, because helicopter is not covered by medical insurance.
They give you a bunch of stickers to put around your home and in your vehicles. I put one sticker in the car, and one sticker on each of our bicycles. I also carry the membership card in my wallet. The part that makes me feel better though is that one of the stickers is on her bicycle.
2009 Trek 7.2FX WSD, brooks Champion Flyer S, commuter bike