chief executive lockheed martin corp tell president-elect donald trump friday commit drive cost company f-35 fighter jet day trump take aim cost f-35 twitter post ceo marillyn hewson say speak trump friday afternoon assure hear message loud clear reduce cost f-35 trump tweet post late thursday suggest old aircraft make rival aerospace company boeing co could offer cheap alternative f-35 base tremendous cost cost overrun lockheed martin f-35 ask boeing price-out comparable f-18 super hornet trump say hewson statement post twitter say good conversation trump friday give personal commitment drive cost aggressively say statement lockheed share close 1.3 percent friday near low level since nov. election big drag basket defense-related stock boeing stock end near unchanged mark trump meet chief executives lockheed boeing wednesday boeing f-18 old generation aircraft lack stealth capabilities f-35 one u.s. official say impossible tell trump mean tweet give importance stealth technology way counter advance defenses near-peer state like russia china somebody need ask donald trump go able confront china without aircraft capable penetrate anti-access area denial systems include air defenses official say defense analysts consider two jet comparable aircraft impractical irrational richard safran defense analyst buckingham research say email first f/a-18 carrier-based naval fighter certainly could meet u.s. marine corps need vertical lift would suitable air force either extra weight carrier fighter make less ideal air force unless rule physics change make non-stealthy two-engined carrier-based aircraft 1980s single-engine multi-role stealthy fighter 2000s vertical research partner analysts write note friday still trump dissatisfaction program dog problems cost escalate estimate 379 billion clear risk lockheed f-35 program critical sales generator company account 20 percent last year total revenue 46.1 billion pentagon respond request comment thursday boeing spokesman todd blecher say thursday email company commit provide capability affordability meet national security need wednesday trump meet ceos lockheed boeing resort palm beach florida boeing ceo dennis muilenburg tell reporters guarantee cost would get control replacement air force one presidential plane another project trump call expensive trump tell reporters want cut f-35 program cost trump jockey leverage via twitter account likely hurdle u.s. defense contractors roman schweizer aerospace defense analyst cowen co write client note thursday trump unleash tirade hefty cost u.s. aircraft early month first lash boeing cost replacement air force one presidential plan days late lockheed f-35 since trump first tweet air force one dec. lockheed share slump around 6.4 percent cost shareholders collectively billion lose market value idea play believe twitter risk defense company could significant issue next four years cowen schweizer write lockheed martin time barrel lockheed ceo tell trump work drive cost f-35