Mike and Jane Contract to Purchase and Sell $1,000,000 Worth

Mike and Jane contract to purchase and sell $1,000,000 worth of computer chips to be manufactured in Japan and shipped to San Francisco.The contract is silent about the method of delivery.Mike asserts that delivery is by ship,which is customary in the computer chip industry,but Jane insists that delivery is by air,which is what a previous contract between Mike and Jane provided.Explain how a court will resolve this dispute.