NEW YORK--(BUSINESS WIRE)--Fitch Ratings has today assigned Avation PLC (Avation) a Long-Term Issuer Default Rating (IDR) of 'B+' and a senior unsecured debt rating of 'B+/RR4'. The Rating Outlook is Stable. A full list of rating actions follows at the end of this release. Avation is a Singapore-headquartered commercial passenger aircraft leasing company focused primarily on turbo prop aircraft in the Asia-Pacific region. As of March 31, 2015, its fleet was comprised of 19 ATR72 500-600s and 10