Marge Sweeney, of Hershey, Pennsylvania, said she was stuck in Orlando.
"I'm not too happy," Sweeney said.
Sweeney said she's stuck in Orlando for the next nine hours. Her Allegiant Air flight was delayed
"How am I going to get my car? How is it going to inconvenience me?" She asked. "What am I going to do for the next nine hours in the airport with nothing to do?"
Stephane Bealieu's flight was delayed a few hours this morning.
"A little bit angry," he said.
People have been tweeting their frustration over Allegiant Air's delays and cancellations.
On Twitter, Mel said there was a more than four-hour delay in Memphis. Maura said her husband's flight out of Clearwater was canceled.
Allegiant Air released a statement to Fox 35 on Monday morning saying:
"With the summer heat, the extra demand on our aircraft and the pace of operations during peak travel periods comes commensurate mechanical issues and other unusual service interruptions. Many flights in Orlando-Sanford (SFB) are experiencing delays due to an unplanned need for simultaneous aircraft swaps, and a lack of available replacement aircraft to continue flights on time. Our overall safety record continues to be one of the best in the industry, and we continue to operate every flight with the safety of our passengers and crew as our number one priority."
Officials at Allegiant Airs also said passengers are being contacted about compensation for the inconvenience, as well as options for their flight:
"We sincerely apologize for any inconvenience to our passengers. Due to operational needs throughout the system, Allegiant has been left with no choice but to delay and often reschedule these flights. We are very sorry for the disruption in passengers' travel plans, but their safety is our number one priority."
Sweeney said, "It's pretty scary. This day and age, you want to make sure you're safe. And, you certainly pay enough money to take an air flight."
The airline adds that it doesn't have enough replacement planes at the Sanford airport, which contributes to the delays there. Folks said they're anxious to get home.
Allegiant Air officials say passengers may contact the call center at 702-505-8888 between 4 a.m. and 11 p.m. pacific time. They recommend calling early in the morning or later at night for the shortest wait times.