This was a difficult week for Edison, by far the nation's largest commercial operator of public schools.

Day visitors come to the island via a number of commercial operators.

Hackett remains one of the largest commercial operators, with concerns in several countries.

Administrative call signs are used with air traffic control facilities similar to those of commercial operators.

Although designed in the 1960s, over 750 are still in service with commercial operators around the world.

No duty is laid on the majority of commercial operators to pay any attention to the specifications.

Access is via private vessel or by permitted commercial operators.

But commercial operators compete for a small pool of advertising revenue.

In about 1880, she began work as a commercial operator for Western Union.

It also was used by many commercial operators and for some military purposes.