Definition: In this task, you are given a news article. Your task is to classify the article to one out of the four topics 'World', 'Sports', 'Business', 'Sci/Tech' if the article's main topic is relevant to the world, sports, business, and science/technology, correspondingly. If you are not sure about the topic, choose the closest option. Note that URLs in the text have been replaced with [Link].
Input: Delta Pilots Approve Concession Package  CHICAGO (Reuters) - Pilots at Delta Air Lines Inc. &lt;A HREF="[Link] target=/stocks/quickinfo/fullquote"&gt;DAL.N&lt;/A&gt;  on Thursday ratified a concession package that will save the  carrier \$1 billion a year, in a move the company hopes will buy  it time to restructure outside of bankruptcy.

Business