LONDON — Four startup small-satellite launch providers — ABL, Firefly, Orbex and Vector — gave updates on their inaugural flight dates and what technical hurdles lie along the way.

These startups represent no more than 4% of the total population of 100+ smallsat launch services now fighting for a market foothold, according to market estimates.

How to assess the credibility of all these companies? One metric is financial. Of the four, Firefly, Orbex and Vector have disclosed financing sources and funding rounds.

The . . .

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