Spend more time smiling than frowning and more time praising than criticizing.

Business has to give people enriching, rewarding lives...or it's simply not worth doing.

And in the process, we have come up with fuels - algae-based fuels, isobutanol-based fuels and other fuels - that we think will power the planes in the future so that, you know, by 2020 I hope that our planes will be powered on fuels that are clean fuels and are not polluting the environment so that we'll have a green airline and an airline that actually has fuels that will be hopefully cheaper than the dirty fuels of the past. So [we're] doing good and also turning a profit at the same time.

I have never had an office that I work out of and work has become intertwined with my personal life.

However tight things are, you still need to have the big picture at the forefront of your mind.

Happiness doesn't come from making a fortune and owning lots of possessions. 'Stuff' doesn't bring happiness. Family, friends, good health and the satisfaction that comes from making a positive difference are what really matter.

When people warn me against doing something once my mind is made up, I grow increasingly determined to try it.