OKLAHOMA CITY--(BUSINESS WIRE)--Sonic Corp. (NASDAQ:SONC), the nation’s largest chain of drive-in restaurants, today announced results for the first fiscal quarter ended November 30, 2014. Key highlights of the company’s first quarter of fiscal year 2015 included: Net income per diluted share was $0.18 compared with net income per diluted share of $0.14 in the prior-year period; excluding items outlined below, net income per diluted share was $0.13 in the first fiscal quarter of 2014, resulting