S . ▁Air ▁Force . ▁The ▁mer ger ▁places ▁some ▁U . S . ▁Navy ▁and ▁all ▁U . S . ▁Air ▁Force ▁strateg ic ▁air l ift ▁resources ▁under ▁M AT S . ▁ ▁June ▁ 4 ▁Philipp ine ▁Airlines ▁begins ▁the ▁first ▁trans p ac ific ▁sle eper ▁service , ▁using ▁Douglas ▁DC - 6 ▁air lin ers ▁between ▁San ▁Francisco , ▁California , ▁and ▁Man ila ▁in ▁the ▁Philipp ine ▁Islands . ▁A ▁passenger ▁and ▁a ▁crew ▁member ▁ab o ard ▁a ▁Jug oslov ens ke ▁Sov jet ▁Transport ▁A via cija ▁( J UST A ) ▁Douglas ▁C - 4 7 ▁Sky train ▁draw ▁guns ▁during ▁a ▁domestic ▁flight ▁in ▁the ▁Social ist ▁Federal ▁Republic ▁of ▁Y ug oslav ia ▁from ▁Be og rad ▁to ▁Sar aje vo ▁and ▁force ▁the ▁pilot ▁to ▁fly ▁to ▁B ari , ▁Italy . ▁ ▁June ▁ 5 ▁– ▁The ▁U . S . ▁Air ▁Force ' s ▁second ▁North rop ▁Y B - 4 9 ▁jet - power ed ▁flying ▁wing ▁bom ber ▁prototype ▁crashes ▁during ▁a ▁performance ▁test ▁flight ▁on ▁the ▁test ▁range ▁in ▁California ' s ▁Ant el ope ▁Valley , ▁killing ▁all ▁five ▁men ▁on ▁board . ▁The ▁air frame ▁has ▁ 5 7 ▁hours ▁of ▁flight ▁time ▁on ▁it ▁at ▁the ▁time ▁of ▁ ▁the ▁crash . ▁ ▁June ▁ 8 ▁– ▁Air ▁India ▁comm ences ▁a ▁regular ▁Bomb ay - Lond on ▁service ▁using ▁Lock he ed ▁Const ell ations . ▁ ▁June ▁ 1 7 ▁A