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.
Tango paid seat selection is only available when booking directly at aircanada.com/agents. All passengers including those booked on Tango fares can use web check-in and select their seat up to 12 hours before departure. Click here for more information on Air Canada s web check-in.ango paid seat selection is only available when booking directly at aircanada.com/agents. All passengers including those booked on Tango fares can use web check-in and select their seat up to 12 hours before departure. Click here for more information on Air Canada s web check-in.
The following will help in choosing economy-class seats for a plane ride of any duration. Difficulty: Average. Time Required: 30 Minutes. Here's How: 1  Choose your seats as soon as possible so that you have the widest selection of locations from which to pick.2  Normally, you can do this when you buy tickets online. ( 3 Exceptions are when your flight is in the distant future or you select a flight on an airline that does not display seats).ere's How: 1  Choose your seats as soon as possible so that you have the widest selection of locations from which to pick. 2  Normally, you can do this when you buy tickets online.