Passage 1
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 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 oversized or over-weight baggage.
15.This passage is probably taken from ______.