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Isn't Castor 120 larger? -- 173.79.164.251 ( talk) 01:36, 15 March 2016 (UTC) reply

Yes it is, and the European P120 it is even bigger (144 tons of propellant mass vs 43 tons o propellant mass in the AJ-60A).-- Planvi ( talk) 07:21, 7 July 2020 (UTC) reply

P120 (rocket stage), in development 2020 - Rod57 ( talk) 10:20, 1 January 2021 (UTC) reply

What do they sell for - approx ? $1M or $10M ? What do ULA pay for them (some say $6-7 M) (but they add about $10M each to an Atlas-V launch price?) ? What did Lockheed-Martin pay for them (prior to ULA) ? What else apart from Atlas V were they used for ? - Rod57 ( talk) 09:59, 1 January 2021 (UTC) reply

GEM says "GEM-63XL offers higher performance at almost half the cost of the AJ-60A boosters currently being used on the Atlas V. ^[1]" - Rod57 ( talk) 10:11, 1 January 2021 (UTC) reply