For travellers who drive more than fly, lower oil prices should also help keep trip costs in check.

BBC: Business travel outlook for autumn

It's difficult to determine height accurately, it was maybe three or four hundred feet, quite a bit lower than helicopters would normally fly at.

BBC: Wind link to Colin McRae helicopter crash

In the United States, people can fly model aircraft without approval from the Federal Aviation Administration if they keep the drone in line of sight, lower than 400 feet above ground and away from airports and air traffic.

CNN: PETA eyes drones to watch hunters, farmers