washington u.s. treasury review license boeing co airbus sell aircraft iran department head steven mnuchin say wednesday tell lawmakers would increase sanction pressure iran syria north korea use everything within power put additional sanction iran syria north korea protect american live mnuchin say testimony house ways mean committee assure big focus mine discuss president mnuchin elaborate review license issue 2015 agreement tehran world power lift sanction return curb iran nuclear activities statements follow president donald trump middle east trip call iran stop fund terrorists militias review suggest trump support boeing defense jetliner businesses could political limit iran accuse washington support terrorism back rebel syria say halt airplane deal would breach 2015 nuclear agreement mnuchin tell ways mean hear sanction really work responsible bring iran negotiate table ahead nuclear deal boeing lose iranair deal could affect 777 production since 15 widebody jetliners include first approve batch boeing aircraft due delivery iranair 2020. deliveries start may next year boeing say december would cut 777 output 40 percent year plan include iranair still-tenative order iranair agree buy 200 u.s. european passenger aircraft worth 37 billion list price though deal typically include big discount include 80 jet boeing 100 airbus 20 turboprops franco-italian atr aircraft need u.s. license reliance u.s. part boeing continue follow lead u.s. government regard work iran airlines contract iran airlines contingent upon u.s. government approval spokeswoman say email airbus spokesman immediate comment first business islamic republic since u.s. president donald trump take office vow tough stance iran january boeing last month announce tentative deal sell 30 jet iran aseman airlines third-largest carrier boeing say would apply license deal people involve deal say treasury far issue license main contract western suppliers iranair many need renew beyond 2020. iranair need approvals take delivery first 70 aircraft say though legal experts say u.s. treasury withdraw license time third airbus jet 37 also due arrive 2020 include three already deliver iranair last week take delivery four atr turboprops plan take remain 16 next year even license place bankers say talk iran western bank fund deliveries aircraft disrupt concern sanction could reintroduce bank could penalize deal iran treasury chief say review iran 's aircraft license