"We spent 16,000 hours in the air doing surveillance flights for drug interdiction," Mr. Howard said.

General Arrieta said surveillance flights were continuing over the region.

There were not enough ships to defend anything much bigger than Long Island on a calm day, and the surveillance flights reported nothing unusual.

The surveillance flights begin before dawn and go on for 10 hours.

Such surveillance flights, complementing satellites, would provide regular scrutiny for both sides.

Imposing such a no-fly zone wouldn't have to involve constant surveillance flights.

Is it not possible, though, to use inspections, surveillance flights, and other non-violent means to prevent him from getting his hands on dangerous weapons?

It has pertinence, however, if we resume the surveillance flights.

Both were likely too busy organizing the newly arrived muscle hijackers and taking their cross-country surveillance flights.

The United States surveillance flights were suspended pending an investigation of the incident.