は乗客の安全

passenger safety

→ は
phrase Rare #39,352
passenger safety 乗客の安全 means “passenger safety.” In these examples, は is the topic marker attached to the preceding noun, not part of the phrase itself.
JA: 航空会社は乗客の安全を最優先にしています。
EN: The airline puts passenger safety first.

運転手は乗客の安全に責任がある

The driver is responsible for the safety of the passengers.

旅客機パイロットは乗客の安全に対し責任がある

Airline pilots are responsible for the safety of their passengers.

船長は乗客の安全に対して責任がある

The captain is responsible for the safety of the passengers.

バスの運転手は乗客の安全について責任がある

The bus driver is responsible for the safety of the passengers.