Airlines and airports say they are stepping up security before next week’s presidential inauguration, with Delta and other major airlines saying they will prohibit passengers flying to the Washington area from putting guns in checked bags. The moves follow the Jan. 6 riot at the U.S. Capitol by supporters of President Donald Trump and politically tinged confrontations on some flights. Delta Air Lines was the first to announce Thursday that it will prohibit checking guns to Washington-area airports and was followed later in the day by United, Alaska, American and Southwest.