* Air Canada load factor up at 83.5 pct vs 81.5 pct year ago
* WestJet load factor 86.1 pct vs 86.2 pct last year
* Porter load factor 58.1 pct vs 59.8 pct
April 3 (Reuters) - Air Canada, Canada’s biggest airlines, said passenger levels for March remained strong compared to a year earlier, while the country’s No. 2 carrier, WestJet Airlines, reported a fall in its numbers.
Air Canada said its load factor, or the percentage of available seats filled with paying customers, rose to 83.5 percent in March from 81.5 percent a year earlier.
Traffic increased faster, by 3.4 percent, as the capacity, or available seat miles, rose 1.0 percent.
The company reported increased traffic in the domestic, the Pacific and the U.S. trans-border markets.
Calgary-based WestJet Airlines said its load factor, or the percentage of available seats filled with paying customers, fell 0.1 percentage points to 86.1 percent.
Traffic for Calgary-based WestJet increased 8.2 percent, while capacity, measured in available seat miles, rose 8.4 percent from March 2012.
Porter Airlines, which competes with Air Canada and WestJet on certain short-haul flights in Canada and a handful of routes to the United States, said load factor slipped 1.7 percentage points to 58.1 percent.
Capacity for Porter Airlines rose 0.7 percent and traffic fell 2.1 percent for March, from a year earlier.
WestJet shares fell 1.5 percent to close at C$24.81, while Air Canada shares ended the day down about 1 percent at C$3.81 on the Toronto Stock Exchange on Wednesday.