whAt DoEs "in-Flight sErviCE" ( linE 1, pArA, 5 ) mEAn
[A] sErviCE on thE plAnE. [C] Flights within onE Country.
[B] A nEw sAFEty DEviCE. [D] ChArgE-FrEE Air sErviCE.
A．whAt DoEs "in-Flight sErviCE" ( linE 1, pArA, 5 ) mEAn
B．sErviCE on thE plAnE.
C．A nEw sAFEty DEviCE.
D．Flights within onE Country.
E．ChArgE-FrEE Air sErviCE.