Decide which of the phrases are the advantages of travelling by plane and which are the disadvantages.

• Группы
  • Advantages
  • Disadvantages
• Варианты
  • Traveling by plane can save time.
  • It's the safest way of traveling.
  • Flights can be delayed or even cancellled.
  • Flights can cause some health problems.
  • Air travel is bad for the nature.
  • The flight tickets are not expensive if buy them several weeks before your trip.
  • The flight tickets are expensive if you buy them several days before your trip.