Southwest tightens face-mask rule, Delta steps up testing

DALLAS (AP) — Southwest Airlines says it won’t allow health waivers to its face-mask rule. Only children under 2 will be exempt from the requirement to cover their mouth and nose during flights. Meanwhile, Delta Air Lines said Thursday that it will expand its coronavirus testing of employees to include at-home tests. Air travel has collapsed because of the virus pandemic, and airlines are trying to convince passengers and their own employees about safety. All airlines require passeng