From the last Infratil report:
Glasgow Prestwick handled 163,389 passengers during the month, up 1% on November 2006.
Growth against the prior year is a result of Ryanair services to Derry, Belfast and Kaunas, and Wizz Air's Katowice route.
Ryanair also launched a new three times weekly service to Budapest at the start of November which has performed well in its first month.
Further Ryanair expansion is considered unlikely after discussions about a significant future phase of growth ended as a result of being unable to reach mutually acceptable commercial terms.
Clearly they find Ryanair's terms, which they inherited, too oppressive.