PARIS — Europe’s ArianeGroup plans to launch just one new-generation Ariane 6 rocket in 2020 — the lighter-version Ariane 62 — and will wait until mid-2021 to start operations of the commercial workhorse, the heavier-lift Ariane 64, under a schedule presented to Ariane users.

Under a scenario still susceptible to modification as Ariane 6 development clears its multiple milestones, the Ariane 64 rocket would be sold on the commercial market for $130 million. The Ariane 62 would be priced at $85 million.

The price targets assume that . . .

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