Wesco Aircraft Holdings Inc. renewed on Monday a supply chain service agreement with Gulfstream Aerospace Corp. The Valencia company will supply hardware and electronic components to Gulfstream, a builder of business jets based in Savannah, Ga. Wesco Chief Executive Dave Castagnola said the agreement builds upon a longstanding relationship with a valued customer. “It positions us well on growth platforms and to expand our service offerings in the future,” Castagnola said in a prepared statement. Shares closed down 7 cents, or less than 1 percent, to $10.81 on the New York Stock Exchange.