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: NASA Delays Mach 10 Flight Aviation enthusiasts awaiting the historic flight of NASA's experimental X-43A 'scramjet' will have to wait another day. Mission planners hope to fly the unmanned jet at a record-breaking 7,000 mph. By Amit Asaravala.

Sci/Tech