Net income in the second quarter of 2013 was $5.2 million, or $0.34 per diluted share, unchanged from the same period of last year. Year-to-date net income in 2013 was $13.7 million, or $0.90 per diluted share, compared with net income of $11.3 million, or $0.75 per diluted share, in the same period of last year. Earnings per share for the second quarter and year-to-date periods of 2012 have been restated to reflect the impact of the three-for-twenty Class B stock distribution to shareholders of record on October 29, 2012.
Aerospace Segment Review (refer to sales by market and segment data in accompanying tables)
Sales in the second quarter to the Commercial Transport market increased due to higher sales of cabin electronics products as global demand for passenger power systems continued to be strong. Military sales were up when compared with the prior year's second quarter as volume increased in airframe power, avionics and aircraft lighting sales to this market. Sales to the Business Jet market were down when compared with last year's second quarter as higher avionics sales due to the addition of Max-Viz's enhanced vision systems products were more than offset by lower aircraft lighting and airframe power sales to this market. The increase in second quarter FAA/Airport sales was due to increased volume from the FAA during the quarter.
In the first six months of 2013, sales to the Commercial Transport market increased primarily on higher demand for Cabin Electronics products, as well as increased sales of aircraft lighting. Military sales in the first six months were up compared with last year primarily as a result of higher sales of avionics, aircraft lighting and airframe power products. Sales to the Business Jet market were up slightly when compared with the first six months of last year as avionics products sales increased due to the addition of Max-Viz. This was partially offset by lower aircraft lighting and airframe power sales. FAA/Airport sales in the first six months were higher as compared with last year from increased volume.
Aerospace operating profit for the second quarter of 2013 was $11.4 million, or 16.7% of sales, compared with $10.9 million, or 17.5% of sales, in the same period last year. Leverage from higher sales was offset by increased E&D and compensation costs. Higher SG&A expense reflects incremental SG&A of $0.6 million in the quarter from Max-Viz which was acquired in July 2012.
Year-to-date 2013 Aerospace operating profit was $25.7 million, or 18.3% of sales, compared with $22.8 million, or 18.3% of sales, in the same period last year. The increase in the operating profit was due to leverage from the increased sales volume partially offset by increased E&D costs and increased legal and compensation costs. Higher SG&A expense was primarily due to the July 2012 acquisition of Max-Viz, which incrementally added $1.2 million to SG&A in the first six months of 2013.
Bookings during the second quarter and first half of 2013 were $65.7 million and $141.1 million, respectively, compared with bookings of $75.7 million and $134.2 million in the second quarter and year-to-date periods of 2012, respectively. Backlog at the end of the second quarter was $111.7 million.