Why do jet engines have to be made of alloys?

2. What caused the two Comet crashes of 1954?

3. What advantages do turbine engines have over reciprocating engines?

4. What is distinctive about the Boeing 747 that makes it easy to spot?

5. What factors ended the Concorde program?

6. What changes did the jet era bring to airports?

7. What one big advantage do jet planes offer passengers?

8. What are some design features aircraft of the future may include?

9. How long would it take to fly from New York to London in a hypersonic aircraft?

How would widespread supersonic air travel change the world?

What would be some good consequences, and what would be some bad ones?