As hundreds of thousands of Americans return to flying this summer, many inconveniences are coming back. Experts say travelers should expect a hike in cancellations and other problems throughout the summer.

With a rise in interest in flying, lines at airports are longer, and delays and cancellations are seemingly more common. American Airlines has had days where it canceled hundreds of flights, and upwards of 800 were reported in single days.

Some factors that have caused a hike in cancellation and delays are also the weather that many parts of the U.S. have experienced in the last few weeks. But another hurdle airlines are facing is a shortage of staff.

The shortage was created from early retirement offers and furloughs. American Airlines offered to buy out pilots who were bearing retirement to save money during the pandemic.

A problem that is arising from this is that many pilots need recertification, and there isn’t enough time to train and recertify pilots to meet the surge in demand.

The uptick in interest in flying is always a welcoming sign for the times, as many Americans are comfortable with traveling. However, there are many issues that airlines currently face. Luckily, experts believe that the airline industry is on the path to recovery.