This week We look at what you need to do when you have a flight to catch Young people occasionally travel alone. Some airlines allow children as young as five to take direct flights alone if their parents pay for a special travel plan. A special guardian will be assigned to look after the underage traveller, making sure they don't get lost after entering the immigration area ( ). However, young people between the ages of 12 and 17 are allowed to fly alone with few restrictions. If you plan to do so, you should know the following words and phrases. At the check-in counters First of all, the attendant checks if you have a valid ticket, passport and visa (a document that allows you to enter certain country). Some people prefer to carry their luggage themselves so they don't have to wait to pick it up at the baggage-claim area ( ). We call that 'hand-carry luggage' or simply 'hand luggage' ( ). Next, the attendant may ask: 'How many bags will you be checking in?' ( ). You can say: 'I have two bags to check in.' ( ) or 'None. I only have one piece of hand luggage.' ( ) You should be careful not to exceed the luggage size and weight limits. Not all attendants bother to check what type of seat a passenger prefers. The two choices are the window seat ( ) and the aisle seat ( ). You can say: 'I would like to sit by the window, please' ( ) or 'I would like an aisle seat' ( ).