Apologies, the stuff I was thinking about is for low pressure applications.

Looks like Plews - Edelman make a reuseable fitting for air hoses similar to the reuseable type for braided hydraulic hose.

http://www.amazon.com/Plews-Lubrimatic-22-133-Reusable-Fitting/dp/B00176FBJG
http://www.doitbest.com/Air+Hoses+and+Fittings-Plews+Lubrimatic-model-22-133-doitbest-sku-578886.dib

And they still make ferrule repair kits

http://www.plews-edelmann.com/accessories/