One of Pittsburgh's biggest airlines scaling back flights

One of Pittsburgh International Airport's biggest airline by number of passengers is cutting back sharply. Southwest Airlines, hit by the large fall in demand due to the COVID-19 crisis, announced late Tuesday that it would cancel 1,500 of its 4,000 daily flights effective Friday. That's about 500 more daily flights than it had announced late last week; Southwest has already announced plans for sharp cuts in its flight schedule beginning in April. Southwest is the third-biggest airline by capacity…