(CNN) -- Much of the East Coast was digging out Sunday after a monster winter storm caused record snowfall in some areas, disrupting holiday travel and shopping and leaving at least four people dead. But the worst of it appeared to be in sight. Winter storm warnings for New York and Long Island expired at 11 a.m. ET Sunday, and warnings for the Boston, Massachusetts, metro area and much of southeastern New England expired at noon. By early Sunday, Bethesda, Maryland, had recorded a whopping 23 inches of snow, and Medford, New Jersey, had seen 24 inches. Philadelphia, Pennsylvania, received its second-highest snowfall in a single event, with 23.2 inches.
@highlight
NEW: American Airlines canceled 160 Sunday flights and 20 scheduled for Monday
@highlight
NEW: About 28,000 still without power in western North Carolina, utility official says
@highlight
Several East Coast cities see record-setting snows of about 2 feet
@highlight
At least four dead in Virginia; residents urged to stay home
The 20 Boston and @placeholder flights were grounded because of the backlog of flights the airline has to manage in the wake of the storm.