By August Graham, PA Business Reporter & Lawrence Matheson Esken, the owner of Southend Airport, has gone into administration after a rescue deal fell through. Administrators from AlixPartners have been appointed after it revealed that a potential restructuring plan was no longer “commercially viable.” But the future of the airport is not in doubt as it was recently sold to a new owner. a deal which secures the future of the Airport is unlikely to be affected by the administration, the business said. Two weeks ago Esken reached an agreement to hand over the majority stake in the airport to pri…