Travelling is still treacherous in most of Atlantic Canada after a blizzard blasted through the region, closing down offices, schools, roads and cancelling flights — affecting airlines across Canada and the U.S.

Whiteouts in Nova Scotia, New Brunswick, and Newfoundland and Labrador prompted police to urge the public to stay off the roads as plough operators began clearing the piles of snow.

Numerous flight delays and cancellations were reported in the major airports of Atlantic Canada. Midday Saturday, there were reports of a power outage at St. John's airport.

Air Canada is warning passengers flying to and from certain cities to expect either delays or cancellations in:

- Saint John

- St. John's

- Toronto Pearson and island airports

- Boston

- New York's LaGuardia, JFK and Newark, N.J., airports

- Philadelphia

- Washington, Ronald Reagan Baltimore

- Chicago

The storm whipped through the Maritimes on Friday before passing southeast of Newfoundland's Avalon Peninsula overnight, cancelling flights and causing whiteout driving conditions.

Meanwhile, the same system dumped snow all over the U.S. Northeast, shutting down roads and schools, and delaying thousands of airline passengers.

At Halifax's Stanfield International Airport, cancellations are dwindling.

However, many people trying to get home to the Maritimes from the U.S. are having a tough time finding a flight.

Helen Clarke is trying to get home to Sackville, N.S., after her US Airways connecting flight from the United Kingdom was cancelled due to the storm. She has been stuck in Philadelphia since Thursday. She estimates dozens of Nova Scotians are faced with the same problem.

Clarke said she has tried to get on three other flights out of Philadelphia, but each has been cancelled

“We have been abandoned by US Airways. They are making no announcements, they are not telling us anything, they're not giving us any food vouchers, they're not giving us any pillows, they're not putting anybody up in hotels. They're refusing to speak to us."

US Airways has not returned a call from CBC seeking comment

Clarke said it looks as if it will be another five days before she and her family can fly out.

She's not alone.

An estimated 3,200 flights were cancelled in the U.S. Northeast corridor — including Chicago, Boston, Washington D.C. and New York — between Friday and Saturday morning. Officials have said to expect more cancellations or delays over the weekend.

Earlier on HuffPost:

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  • No. 10 Hartsfield-Jackson Atlanta International Airport (ATL)

    <strong>Flights Delayed:</strong> 20.1%<br><br> Atlanta has managed to improve its on-time departure performance a few points over the past years, but consistently finds itself dawdling its way into the worst 10.<br><br> <strong>Best Time Window:</strong> Before 9 a.m.<br><br> <strong>Worst Time Window:</strong> 4–10 p.m.<br><br> <em>Photo: Courtesy of Hartsfield-Jackson Atlanta International Airport</em><br><br> <a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/3" target="_hplink">See all of America’s Worst Airports for Flight Delays</a>

  • No. 9 Denver International Airport (DEN)

    <strong>Flights Delayed:</strong> 20.2%<br><br> What happened? Until now, the only bad-mouthing Denver’s remodeled airport has received is for its rather curious design. While most travelers aren’t bothered by architectural conspiracy theories, sitting around 20 percent of the time is another matter.<br><br> <strong>Best Time Window:</strong> Before 8 a.m.<br><br> <strong>Worst Time Window:</strong> 4–9 p.m.<br><br> <em>Photo: Steve Hamblin / Alamy</em><br><br> <a href=" http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/4" target="_hplink">See all of America’s Worst Airports for Flight Delays</a>

  • No. 8 Miami International Airport (MIA)

    <strong>Flights Delayed:</strong> 21.2%<br><br> This Florida hub gets the Nice Try award: it’s still in the worst 10, but has improved its performance by four percentage points and climbed its way up from last year’s second-worst position. Your best bet here is to fly out by lunchtime. <br><br> <strong>Best Time Window:</strong> Before 8 a.m. <br><br> <strong>Worst Time Window:</strong> 3–9 p.m. <br><br> <em>Photo: Courtesy of Miami-Dade Aviation Department</em><br><br> <a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/5" target="_hplink"> See all of America’s Worst Airports for Flight Delays</a>

  • No. 7 Chicago O’Hare International Airport (ORD)

    <strong>Flights Delayed:</strong> 21.4%<br><br> The best one can say about O’Hare’s standing is that it could have been worse, given its years-long bad reputation. (Back in 2008, your overall odds of getting delayed were 35 percent.) After a few years of steady improvement, on-time performance went down one percentage point this year. <br><br> <strong>Best Time Window:</strong> Before 7 a.m. <br><br> <strong>Worst Time Window:</strong> 5–11 p.m. <br><br> <em>Photo: Mira / Alamy</em><br><br> <a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/6" target="_hplink">See all of America’s Worst Airports for Flight Delays</a>

  • No. 7 Newark Liberty International Airport (EWR)

    <strong>Flights Delayed:</strong> 21.4%<br><br> Tying with O’Hare for on-time performance is kind of like winning an ugly dog contest. The consolation may be that while EWR offers basically the same chance of being late as it did last year, the airport still improved its rank by two slots. <br><br> <strong>Best Time Window:</strong> Before 8 a.m. <br><br> <strong>Worst Time Window:</strong> 3–11 p.m., and at its very worst 9–11 p.m. <br><br> <em>Photo: Courtesy of The Port Authority of NY & NJ</em><br><br> <a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/7" target="_hplink">See all of America’s Worst Airports for Flight Delays</a>

  • No. 5 John F. Kennedy International Airport (JFK)

    <strong>Flights Delayed:</strong> 21.6%<br><br> New York’s busiest airport had been making up for lost time over the past four years, but has been lagging recently. On-time performance fell almost two points this year, dragging it down from No. 8. You can bide your time, though, in the wine or martini bars. <br><br> <strong>Best Time Window:</strong> Before 8 a.m. <br><br> <strong>Worst Time Window:</strong> 4–11 p.m. <br><br> Photo: Courtesy of The Port Authority of NY & NJ<br><br> <a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/8" target="_hplink"> See all of America’s Worst Airports for Flight Delays</a>

  • No. 4 Las Vegas–McCarran International Airport (LAS)

    <strong>Flights Delayed:</strong> 21.8%<br><br> If you’re going to debut on the worst list, do it with fanfare. That’s what Las Vegas did, after having years of decent on-time performance. From some fliers, the bright side is more time to play those airport slot machines. <br><br> <strong>Best Time Window:</strong> Before 9 a.m. <br><br> <strong>Worst Time Window:</strong> 2–10 p.m. <br><br> <em>Photo: Courtesy of McCarran Int'l Airport</em><br><br> <a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/9" target="_hplink">See all of America’s Worst Airports for Flight Delays</a>

  • No. 3 San Francisco International Airport (SFO)

    <strong>Flights Delayed:</strong> 22.4%<br><br> Is it just that fog? Every year, SFO inches a little closer to the worst position—from eighth worst in 2008 to sixth worst last year. Things slow down early: on-time performance dips below 75 percent by 11 a.m., and doesn’t go back above that until evening. <br><br> <strong>Best Time Window:</strong> Before 8 a.m. <br><br> <strong>Worst Time Window:</strong> 11 a.m.–7 p.m. <br><br> <em>Photo: Alain McLaughlin/SFO Airport</em><br><br> <a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/10" target="_hplink">See all of America’s Worst Airports for Flight Delays</a>

  • No. 2 Baltimore/Washington International Airport (BWI)

    <strong>Flights Delayed:</strong> 23.2%<br><br> BWI debuted among the 10 worst airports for delays only last year, but it may be here to stay. Its on-time performance got worse by two percentage points this year and is the clear loser among the D.C.–area airports. <br><br> <strong>Best Time Window:</strong> Before 8 a.m. <br><br> <strong>Worst Time Window:</strong> 3–11 p.m. <br><br> <em>Photo: Courtesy of Baltimore/Washington International Airport</em> <br><br> <a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/11" target="_hplink">See all of America’s Worst Airports for Flight Delays</a>

  • No. 1 Chicago Midway Airport (MDW)

    <strong>Flights Delayed:</strong> 29.9% <br><br> Midway worsened its performance by almost four percentage points this year. Your best chance here is to fly out bright and early: on-time performance dwindles late in the morning and languishes below 50 percent by 7 p.m. <br><br> <strong>Best Time Window:</strong> Before 8 a.m. <br><br> <strong>Worst Time Window:</strong> 11 a.m.–11 p.m. <br><br> <em>Photo: <a href="http://www.flickr.com/photos/dougcoulter/3041802148/" class="external" rel="nofollow">Douglas Coulter </a></em><br><br> <strong><a href="http://www.travelandleisure.com/articles/best-and-worst-airports-for-delays/12" target="_hplink">See America’s Best Airports for Flight Delays</a></strong>