The airline doesn't issue the airside pass, the Airport do, be that Manchester airport group, BAA, Peel etc etc.
On a crc check things only normally come up for the last 5 years but some things are always revealed, these include but is not exhausted by crimes against the person, sexual offences and certain drug offences.
most cautions/traffic offences won't come up, most things non custodial won't either.
My advice would be to get a disclosure if you're worried and if it's clear don't worry, it won't change.