Without new landers or rovers, it's helicopters or bust for NASA's Mars program
NASA's cost estimate for SR-1 Freedom is $2.1 billion, but that doesn't include the helicopters.
Source：Ars Technica
Related news
Martian air could yield methane rocket fuel with fewer unwanted byproducts
This NASA-funded 'Slingshot' spacecraft idea could map minerals on planets and moons across our solar system
Blue Origin Nets NASA Mars Orbiter Contract
Perseverance rover watches Earth vanish behind Martian moon
Curiosity Blog, Sols 4988-4994: More New Tricks for an Old Dog
NASA Taps Blue Origin for Mars Communications Network
Looking for companies in this field?
UchUchU maintains a database of Japanese companies in the space industry.