What does the author mainly discuss in this passage
[A] How to avoid car crash. [C] How to educate children properly.
[B] How to design safer baby equipment. [D] How to properly secure children in the ear.

A．catered for the more wealthy people
B．given preferential treatment to executive clients
C．only met the needs of the regular traveler
D．marketed their service with the quantity of the travelers in mind

A．a successful airline in the 1980s meets the needs not only of the masses but also of the wealthy passengers
B．it is more comfortable to sit in the back of jet planes
C．business travelers dislike tourists
D．only by specializing in cheap flights can airlines avoid bankruptcy