El Pollo Loco Holdings Inc. /zigman2/quotes/203043086/composite LOCO +0.37% said Thursday that it has partnered with Flytrex to test drone delivery service in southern California. Flytrex has drones that travel at 32 miles per hour and can provide "door-to-backyard" delivery by lowering orders from 80 feet. Air Loco drone delivery will be available to select loyalty members. Walmart Inc. /zigman2/quotes/207374728/composite WMT -0.04% announced on Thursday that it has invested in a drone company in order to scale up the use of the machines for delivery service. El Pollo Loco stock has fallen 7.8% for the year to date while the S&P 500 index /zigman2/quotes/210599714/realtime SPX +0.05% is up 12.5% for the period.