Not surprising, given that they have lost the contract with Enter air which provided most of their work last year. Last summer, Enter air operated 24 of their own aircraft, another 4 from Go2Sky and 2 A320s from Electra Airways, a Bulgarian ACMI company. This year, Enter air hardly fly 10 aircraft, which is still a lot below their own capacity (18 aircraft now, following fleet reductions). And it's nowhere near certain that they will need any third-party aircraft next summer as nobody knows whether demand will allow even for filling up 18 aircraft, let alone any extra ones.
At some time this summer, Go2Sky did a short siege in Kosovo for one of the local virtual airlines. Exactly what Smartlynx are doing now with two of their aircraft. But do bear in mind that those Kosovan virtual airlines change their partners very often and can be quite unpredictable medium to long term. So, apparently, it was not enough to ensure the survival of Go2Sky. Which is a great pity as they seemed to be a relatively good company, as compared to many others in the region.