Check-in Requirements Passengers and their baggage must be checked in at least 45 minutes before departure for domestic flights and 60 minutes for international flights. Government-issued photo identification is required for all passengers. Passengers traveling across any international boundary (边界) are responsible for obtaining all necessary travel documents. Passengers may be denied boarding if travel documents are not in order. When check-in requirements are not met, a passenger may be separated from his/her bag. Frontier Airlines will gladly hold the bag in the destination baggage service office for pick-up at the passenger's convenience. Passengers must be at the gate 20 minutes before departure for boarding. Free Baggage Allowance for Each Ticketed Passenger Frontier Airlines, Inc. will accept, per ticketed passenger, two free checked bags not to exceed 62 inches and 50 pounds per piece—one carry-on bag and one personal item (purse, laptop, etc.). NOTE: A ticketed passenger may check one carry-on bag if it is within established limitations. All carry-on items must be put under a passenger seat or in a shared overhead compartment (行李舱). Excessive (超重) Baggage Charges An excess charge will be made for each piece of baggage over the free allowance and for each piece of over-sized or over-weight baggage.

单选题 An international flight passenger should check in at least______.

单选题 What is required of all domestic and international passengers for check-in?

单选题 How much baggage is a ticketed passenger allowed free of charge?

单选题 What will passengers have to do if their baggage is over the free allowance?

单选题 This passage is probably taken from ______.