So the problem here, roughly, is given, a number of cities, and say the cost of traveling from city to city by airplane, what's the least cost round trip that you can find?
There is interest in solid drilling or broadcasting soybeans either by field equipment or by airplane.
Tomorrow he would leave by airplane.
They arrived in Belgium by airplane.
The cars arrived to the start point by train and the crew – by airplane.
To get there and back, they traveled for hours by airplane, taxi and rickshaw. They passed through border areas menaced by bandits.
He tried to convince them of the safety of travelling by airplane.
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