TSA officials say the rate of airport screeners missing work during the partial government shutdown has stabilized — but still at unusually high numbers — just before a three-day holiday weekend that is likely to bring bigger airport crowds. The Transportation Security Administration said Thursday that 6.1 percent of its airport screeners missed work Wednesday. That’s higher than the 5 percent absentee rate on the same day last year but the second-straight decline after the sick-out rate surged to 7.7 percent Sunday. A TSA official said screeners this week should have received $500 bonuses and, for some, an extra day’s pay, for working over the Christmas and New Year’s holidays. Meanwhile, air traffic controllers who are also working without pay lost an effort to force the government to pay them.