1.   And Argentina, which has had a long history of tense relations with Chile, also wants to eventually buy its first supersonic fighters.

2.   China has never produced its own supersonic fighters, but has been tinkering with prototype models of such aircraft for more than a decade in its research institutes.

3.   We built a nuclear arsenal and entered the jet age with supersonic fighters.

4.   Backed by its French partners Dassault Aviation, Embraer is one of four competitors for a contract to supply the Brazilian Air Force with a dozen new supersonic fighters.

5.   China has poured tens of billions of dollars into upgrading its arsenal in recent years, buying supersonic Russian fighter planes and developing cruise and ballistic missiles.

6.   We may not need submarines or more supersonic fighters.

7.   The joint strike fighter is a radar-evading supersonic multi-role fighter.