__________1. Peak travel happens a. a change to a better seat or level of service. __________2. When you check in b. a room in a hotel/airport where people can sit and relax. __________3. Frequent-flyer points are c. a card you must show in order to get on a plane. __________4. An upgrade is d. all the people who work at an airport, but not the pilots or cabin crew. __________5. A lounge is e. awarded by airlines to reward customer loyalty. __________6. A boarding pass is f. at times when the largest number of people are travelling. __________7. Ground staff are g. you go to desk at a hotel/airport to say you have arrived.