US aerospace company Lockheed Martin Corp revealed better-than-expected first quarter earnings on Tuesday. The company’s earnings totalled $1.73 billion, or $6.44 per share, just below the $1.84 billion, or $6.56 per share, of earnings in last year’s first quarter. On average, analysts had expected the company to earn $6.21 per share, according to figures compiled by Thomson Reuters. Analysts’ estimates typically exclude special items. The company’s revenue for the quarter fell 8.0% to $14.96 billion from $16.26 billion last year. Lockheed Martin Corp. earnings at a glance (GAAP):-Earnings (Q1…