Although well off topic on the BLK thread. I think horatio_b is referring to the excellent railway link between Blackpool and Manchester that takes you direct to the airport, also stopping at various locations in Lancashre and Greater Manchester such as Preston, Chorley and Bolton.
Never even been to Liverpool airport, but I am told it's not as easy to get to as BLK or MAN from Central Lancashire.
Well if you can get to Liverpool Lime Street, Warrington or Manchester by train then you are just one change away from Liverpool South Parkway station and then its a 6 to 8 minute shuttle bus ride to Liverpool Airport.