From the Allegiant website, flight cancellations for Sunday Oct 18th, rescheduled to the following day.

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Allegiant Air
Travel Advisory
Sunday October 18, 2015

We thank you for flying and choosing us here at Allegiant, where "Travel is our Deal".

Flight 222 originally scheduled to depart Bellingham, WA to Las Vegas, NV on October 18, 2015 will now be operating as flight 5222 on October 19, 2015. The new scheduled time of departure out of Bellingham, WA is 1:30 PM, arriving in Las Vegas, NV at 4:03 PM.

Flight 510 originally scheduled to depart Las Vegas, NV to Bozeman, MT on October 18, 2015 will now be operating as flight 5510 on October 19, 2015. The new scheduled time of departure out of Las Vegas is 8:00AM and arriving in Bozeman at 10:56AM.

Flight 511 originally scheduled to depart Bozeman, MT to Las Vegas, NV on October 18, 2015 will now be operating as flight 5511 on October 19, 2015. The new scheduled time of departure out of Bozeman, MT is 11:36 AM, arriving in Las Vegas, NV at 12:41 PM.

Flight 533 originally scheduled to depart Hebron, KY to Las Vegas, NV on October 18, 2015 will now be operating as flight 5533 on October 19, 2015. The new scheduled time of departure out of Hebron, KY is 11:15 AM, arriving in Las Vegas, NV at 12:25 PM.

Flight 813 originally scheduled to depart Roanoke, VA to St. Petersburg, FL on October 18, 2015 will now be operating as flight 5813 on October 19, 2015. The new scheduled time of departure out of Roanoke, VA is 7:55 PM, arriving in St. Petersburg, FL at 9:49 PM.