One might say Clark's kept abreast of things then!
Funny how a bra can be worn as a comedy headset as well...
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The highest RAF ejection was 56K in a Canberra. The highest (and fastest) ejection was at an incredible M3.25 and 80K in an SR71 variant. The pilot survived, his WSO didn't.
John Roome certainly got a Lighning up to 88K in SE Asia once.