The government shutdown continues to affect American air travel, with staffing issues leading officials to slash flight schedules across the nation. The uncertainty comes ahead of what’s expected to be a very busy holiday travel period,

Airlines have been issuing alerts to passengers to be aware of possible flight impacts; no end to government shutdown in sight.

Traveler discomfort is expected to continue Saturday as flight delays and cancellations imposed by the U.S. Department of Transportation as a result of staffing issues among air-traffic controllers at 40 major airports amid the ongoing federal government shutdown ramp upward.

Overall, United has canceled more than 100 flights each day, from Friday, Nov. 7 through Sunday, Nov. 9, the airline's website showed. Of those, 34 United flights scheduled to depart or arrive at Chicago O'Hare International Airport Friday were cut, with that number increasing to 38 Saturday.

Airports in Southern California on Monday saw more delays and more cancellations imposed by the U.S. Department of Transportation. An estimated 150 flights were cancelled in SoCal airports over the weekend and that number grew on Monday as 221 flights were delayed.

Travelers flying to or from Los Angeles, Ontario and San Diego international airports could experience flight delays or cancellations starting Friday as the U.S. Department of Transportation began imposing cutbacks in flight capacity at 40 major airports nationally.