Could your airline afford the capability to fend off a missile?
My cousin has a stall in the countermeasures souk and can sell you such a system. However the cost of airframe integration and civil certification, per type, vastly exceeds the cost of the equipment per airframe.
Some forward thinking manufacturers are now looking at integration into future airliner production. Otherwise it seems to be the domain of a small minority, your RAF were early adopters of this technolgy on certain airframes: probably those used by senior officers, ministers and of course, their special advisors. http://www.globalsecurity.org/military/systems/aircraft/systems/laircm.htm