I'm going to try to keep this tightly focused on the aviation aspects of this deal, and avoid any discussion of other components.
Looking at the NYT article on it: https://www.nytimes.com/2019/02/07/climate/green-new-deal.html?module=inline
It looks like they would replace a lot of domestic air travel with high speed rail. I doubt they could make all air travel (especially international flights, transcontinental flights and flights to isolated areas in places like Alaska) obsolete, and something tells me it would be very difficult to build a top tier high speed rail system that could replace domestic air travel in 10 years time. Looking at Europe where they have a rail network like this, I could definitely see it replace short flights (like BOS-DC or BTV-NYC) but for longer distances air travel would still work.
WN, LX, AZ, BA, LH, KL, DL, OK, S5, US, UA, VY, IB, AF, LY, F9, CO, YX x2, PD, AC, AA, OO, PT, QK
A319, A320, A321, A332, A333, A343, B712, B733, B737, B738, B753, B744, B764, B772, B789, CRJ9, DH8D, E145, E190