What is the difference between 'voyage' and 'carriage'?

[max]

English Language Tests, Intermediate level

ESL/EFL Test #158 "Airport and flight travel expressions", question 6

Children below age 12 will not be accepted for ......... unless they are accompanied by a person of at least 18 years of age.

(a) journey
(b) voyage
(c) carriage
(d) trip

English Language Tests, Intermediate level

ESL/EFL Test #158 "Airport and flight travel expressions", answer 6

Children below age 12 will not be accepted for carriage unless they are accompanied by a person of at least 18 years of age.

Correct answer: (c) carriage

Your answer was: incorrect
Children below age 12 will not be accepted for voyage unless they are accompanied by a person of at least 18 years of age.
_________________________

Why isn't "voyage" right?

Thank you for your Help
Max

[Mister Micawber]

.
Only 'carriage' works without an article (a, the).
.
_________________
Canadian-American native speaker
who teaches English for a living at Mister Micawber's
ESL cafe: Interview with Mister Micawber