It really is a profound question - "would you sign on for a one-way flight to Mars?"

The fuel carried in his spaceships was only sufficient for the one-way flight there.

The helicopters run around 2,400 times per year, with the average one-way flight being 30 minutes.

A one-way flight takes about 20 minutes and is about $70.

They responded by implementing a surcharge of between $1.50 and $6.00 to a one-way flight starting in July 2012.

Separate boxes must be checked for one-way flights or round trips.

Ethiopian Airlines (0800 635 0644; www.ethiopianairlines.com) has one-way flights from £414.

The researchers calculated that for every 100 million passengers who flew seven one-way flights, there would be one additional cancer.

Josh and Robin had no time to ponder how close they'd come to taking a one-way flight.

A one-way flight on the same route is about $500.