Some automobile manufacturers have recently developed a leaf spring that is constructed of a composite material similar to plastic in order to provide a softer type of rear suspension.
Flight time from New York to Reykjavik is 5 hours 30 minutes. Non-Stop flight duration from JFK to KEF is 5 hours 30 minutes (Operated by JetBlue Airways).
The distance from JFK in New York to LHR London is 1.39 times more distant than Glenn's Los Angeles to New York flight. Therefore extrapolating, John Glenn would have flown from New York to London in 4 hours and 42 minutes. The F-22 would fly the same distance in even less time if it flew supersonic as Glenn did.