Air Canada is waiving flight change fees for almost half a dozen cities in three states as Hurricane Michael beelines for the Florida Panhandle coastline as a Category 4 storm. Air Canada passengers due to fly in or out of Atlanta, Savannah, Charlotte, Raleigh Durham and Jacksonville can change their bookings with no change fees as a result of Hurricane Michael.

Major U.S. carriers are waiving change fees for a long list of destinations as well, and cancelling flights. Hurricane Michael gained strength overnight, with potentially catastrophic winds this morning clocked at 145 mph, making it the most powerful storm on record ever to hit this stretch of Florida coastline, according to reports.

Michael quickly sprang from a weekend tropical depression, reaching Category 4 as it drew energy from the Gulf of Mexico’s 84 degree waters. That was up from a Category 2.

The storm appeared to be so powerful – with a central pressure dropping to 933 millibars – that it is expected to remain a hurricane as it moves over Georgia. Forecasters said it will unleash damaging winds and rain all the way into the Carolinas, which are still recovering from Hurricane Florence’s flooding.