Was'nt sure were to post this,but seems to be a good tip if your going to this airport by train.
I was'nt aware of this,and i'm in Glasgow :)
FREE Rail Travel
For the first 6 months of any new route all passengers are entitled to FREE rail travel to/from Glasgow Prestwick Airport . The rail travel is only applicable on the days that you travel to and from the airport. You can only use the free offer outwith this time if there are no trains from your designated station on your day of travel to the airport.
The route that currently qualifies for the free rail offer is Katowice (from 3 September 2007 - 5 March 2008), Kaunas (from 28 October 2007 - 27 April 2008), Belfast (from 30 October - 30 April 2008), Budapest (from 1 November 2007 - 1 May 2008) and Poznan (31 January 2008 - 30 July 2008)
To get your free travel tickets, produce your original flight confirmation (your booking confirmation with the airline logo) at a First ScotRail Booking Office or the airport's information desk where you'll be issued with a FREE travel voucher to anywhere in Scotland. These free tickets are not available on train.
1/2 Price Rail Travel
All passengers traveling to and from the airport will receive 50% discount on the standard fare. To qualify for the discount passengers have to show their official flight confirmation and photo id to the train conductor when buying their ticket.