President Joe Biden’s climate czar John Kerry was seen maskless on a plane despite requirements that passengers don face coverings, sparking an investigation from American Airlines. Kerry was seen reading a book while on a flight from Boston to Washington on March 17. He was not participating in activities that allow passengers to wear masks, such as eating or drinking. American Airlines said that masks are required on board its aircraft and that it was probing the situation. In February, American’s COO David Seymour said the airlines would mandate masks to align with a Centers for Disease Control and Prevention directive that was issued in accordance with an executive order from Biden. “Our mask requirement has been and will continue to be a critical component of our comprehensive effort to protect the health and well-being of our customers and team members during the pandemic,” he said in a statement. “This …