Southwest, American tighten mask rules; Delta widens testing

DALLAS (AP) — Southwest and American say they won’t allow health waivers to their 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