The Federal Aviation Administration has certified the Boeing 737 Max 7, the smallest model in the best-selling family of aircraft, after nearly a decade of delays. Boeing has about 40 of the 737-7s and 737 Max 10s built and in inventory already, and the FAA approval could help the manufacturer bring in much-needed cash, Jefferies analyst Sheila Kahyaoglu said in a note Sunday. Boeing opened a new production line in Everett, Washington, in July for its 737 Max airplanes. The company has been working to win back the trust of the FAA, and has made strides, including in mid-July, when the FAA said it could once again issue airworthiness certificates for its bestselling 737 Max aircraft and 787 Dreamliners. The agency stripped that from Boeing after the Max 8 crashes, which killed 346 people.