VIENNA (Reuters) - Austrian leisure airline Laudamotion, which is majority-owned by Ryanair , plans to double its Airbus fleet to 18 next year, its managing director said on Wednesday."In 2019, we expect 18 Airbus planes, which adds 9 aircraft to our current (Airbus) fleet," Andreas Gruber told a news conference.Negotiations with a trade union regarding a collective wage agreement are ongoing, Gruber said, adding that Laudamotion will increase the salaries for its pilots from April.