Organic growth in the commercial aviation supply chain and maintenance, repair and overhaul segments, plus a boost from acquisitions, helped AAR Corp. offset several one-time charges and end fiscal 2012 in a strong position; however, year-over-year net profit dipped slightly.

AAR’s fourth-quarter sales totaled $563.3 million, up 15% from the $487.8 million recorded last year. Net income fell 65.4% to $12.9 million from $37.3 million, due in part to some $13.2 million in one-time charges, including $9.5 million related to adjusting “profit expectations” on a Boeing KC-10 support contract, the company said in its fiscal fourth-quarter results call.

AAR’s fourth quarter included 16.5% organic growth in sales to commercial customers, largely in the company’s Aviation Supply Chain and MRO segments, which reported sales of $143.6 million and $125.1 million, respectively. This was the highest for each in the past decade, noted CEO David Storch.

Other growth came largely from newly acquired businesses Telair and Nordisk, added in December 2011. Commercial sales increased 48.5% year-over-year and represented 60% of all fourth-quarter sales.

Full-year sales were a record $2.1 billion, up 14.4% from 2011’s $1.8 billion, while net income fell 3% to $67.7 million from $69.8 million. Commercial sales increased 32.4%, AAR says. At the segment level, the Aviation Supply Chain unit saw sales climb 26.5% to $588.4 million from $465.1 million, while MRO sales increased 7.2% to $422.1 million from $393.7 million.

Looking ahead, the company expects sales of $2.1 to $2.2 billion in 2013, with “continued strength” in the commercial support businesses.