Apparently we do. I was in the sausage roll office this afternoon (software's going through a recession, OK?) and on the back cover of I think it was Recruit for September, there was an advert for Sky Marshalls. Salary 20-48k dep on experience, pay for your own security clearance, on-call 24 hours a day, limited/no contact with family while working, prepared to visit locations that are economically / politically unstable, no phone number, write with CV to an address in...Lancashire.
Hey Muppet, come to think of it you're from up North aren't you?
In slightly more serious (though no more truthful) answer to your question, I think that any hijacker who tried to start anything these days would be torn to pieces before the Sky Marshall got anywhere near him/her.