The light-year is a unit of length used to express astronomical distances. It is about 9.5 trillion kilometres or 5.9 trillion miles. As defined by the International Astronomical Union (IAU), a light-year is the distance that light travels in vacuum in one Julian year (365.25 days). Because it includes the word year, the term light-year is sometimes misinterpreted as a unit of time.
You can select your seat online if: 1  You book your flight on aircanada.com., and. 2  You re travelling on: 3  Seat selection is not available on codeshare flights.4  an Air Canada or Air Canada rouge flight, or. 5  an Air Canada Express flight operated by Jazz, Sky Regional, Air Georgian Ltd. or Exploits Valley Air Services Ltd.ou can select your seat online if: 1  You book your flight on aircanada.com., and. 2  You re travelling on: 3  Seat selection is not available on codeshare flights.
up vote 7 down vote. Partial answer: Airlines that allow you to select seats during booking show how many seats are available, I've used this myself. However the further ahead of the flight you book the more likely it is that more passengers sign up.p vote 7 down vote. Partial answer: Airlines that allow you to select seats during booking show how many seats are available, I've used this myself. However the further ahead of the flight you book the more likely it is that more passengers sign up.