Tim HepherAllison LampertEric Johnson 4 minute read A Boeing 777X airplane takes off during its first test flight from the company's plant in Everett, Washington, U.S. January 25, 2020. REUTERS/Terray Sylvester/File Photo July 26 (Reuters) - Commercial jets delivered by Boeing Co (BA.N) in 2020 will contribute on average to emissions equivalent to 1 million tonnes of carbon dioxide each over their more than 20-year lifespans, data issued by the planemaker showed on Monday. Boeing is the latest company to report so-called Scope 3 emissions that result when customers use their products, amid pressure from investors and climate activists for data on how companies are performing on curbing emissions.