Some good information although a little dated. I copied and pasted a portion I thought to be interesting from page 20. http://inc.skywest.com/invest/Annual...s/10k-2013.pdf

SkyWest Airlines
’
employees are not currently represented by any union; however, collective
bargaining group organization efforts among those employees occur from time to time. Such efforts will
likely continue in the future and may ultimately result in some or all of SkyWest Airlines
’
employees
being represented by one or more unions. Moreover, one or more unions representing ExpressJet
employees may seek a single carrier determination by the National Mediation Board, which could
require SkyWest Airlines to recognize such union or unions as the certified bargaining representative of
SkyWest Airlines
’
employees. One or more unions representing ExpressJet employees may also assert
that SkyWest Airlines
’
employees should be subject to ExpressJet
’
s collective bargaining agreements. If
SkyWest Airlines
’
employees were to unionize or be deemed to be represented by one or more unions,
negotiations with unions representing SkyWest Airlines
’
employees could divert management attention
and disrupt operations, which may result in increased operating expenses and may negatively impact
our financial results. Moreover, we cannot predict the outcome of any future negotiations relating to
union representation or collective bargaining agreements. Agreements reached in collective bargaining
may increase our operating expenses and negatively impact our financial results.