By Mehr Bedi and Mike Stone (Reuters) -General Dynamics beat Wall Street expectations for fourth-quarter revenue on Wednesday, as a tense global political climate sustained demand for its military equipment even as supply-chain pressures drove up costs. Net earnings at the Reston, Virginia-based defense contractor came in at $3.64 per share, below analysts’ average estimates of $3.68, according to LSEG data. The company’s quarterly revenue increased 7.5% to $11.7 billion. Analysts on average were expecting $11.4 billion. Shares were up 1.2% in pre-market trading. Still awaiting Federal Aviatio…