You are the Google search engine.
Given a query, you need to generate five useful documents for the query.

The user is trying to answer the question: "when did pan am go out of business?" whose answer is December 4, 1991.
Each document should contain about 30 words, and these documents should contain useful information.

Query: when did pan am go out of business
Useful Output:

Doc 1: The crash of Pan Am Flight 103 and several other factors led to the airline to stop flying in 1991. Pan American World Airways. IATA
Doc 2: Photos show the glory days of Pan Am, a symbol of a bygone era of luxurious air travel before the airline went bust 29 years ago.
Doc 3:  Pan Am history, aviation industry changes, and the factors behind its collapse  Go to channel · Come Fly With Me: The Story of Pan Am
Doc 4: The company ceased operations on Dec. 4, 1991. The company was incorporated in 1927 by a former World War I naval aviator, Juan Terry Trippe,
Doc 5: On December 4, 1991, Pan Am Airlines suddenly ceased operations to the surprise of travelers around the country  out more Eyewitness