Indeed. However, to the OP, the U.S. is about the size of Europe, and it is unusual for helicopter operators (other than EMS or oil & gas types) to have nationwide coverage.
Blade is pretty much an East Coast phenomenon, and while I've glanced at them, I seem to recall their fleet was a bit long in the tooth last I checked. I have no actual operating experience or customer experience or any association of any kind with any of the links below.
https://www.flyblade.com/?utm_source...ade_Exact_SKAG
Chicago is a different animal entirely, as there are very few places within the city limits to land a helicopter outside of the airports. Though this place appears fairly new.
Home - Vertiport Chicago
https://www.chicagohelicopterexperie...ters/#charters
Your friend will probably need to cultivate contacts in those major metropolitan areas where charters may be desired, and if she has any sense, she'll talk to every operator in each city that might be suitable. The Northeast Corridor probably should start in New York, the Midwest perhaps in Chicago, Southern California in Los Angeles, Texas in DFW or Houston etc. There is not, to my knowledge, any kind of aggregator of helicopter flights for business purposes. I believe Sikorsky used to operate a subsidiary that provided transport services in the Northeast. I don't know if they still do or not. In any case, there are over 5,200 airports in the U.S. and a like number of commercial operators. I suspect she has some homework to do and address book entries to make.