10 are for sure UAL, and I suspect they will go to Mesa. The other 18 are most likely Skywest birds. The second link I had posted had the Skywest ticker symbol listed. Here's the text of that link:

Embraer wins 50 firm orders worth $2.6 billion
Mon Jun 15, 2015 8:16am EDT

PARIS (Reuters) - Brazilian aircraft maker Embraer (EMBR3.SA) announced 50 firm orders for its narrow-body jets at the Paris air show on Monday worth a total of $2.6 billion.

The orders, which also included dozens of options for more jets, came from airline customers United Continental Holdings (UAL.N) unit United Airlines, SkyWest (SKYW.O) and Colorful Guizhou, and aircraft leasing company Aircastle (AYR.N).

(Reporting by Sarah Young; Editing by James Regan)