Pho­to: The Fed­er­al Avi­a­tion Ad­min­is­tra­tion an­nounced Wednes­day that it will re­duce air traf­fic by 10% across 40 “high-vol­ume” mar­kets be­gin­ning Fri­day morn­ing to main­tain safe­ty dur­ing the on­go­ing gov­ern­ment shut­down.

Air­ports in New York, Los An­ge­les and Chica­go are among 40 of the busiest across the U.S. where flights will be cut start­ing Fri­day due to the gov­ern­ment shut­down, ac­cord­ing to a list dis­trib­uted to the air­lines and ob­tained by The As­so­ci­at­ed Press.

The Fed­er­al Avi­a­tion Ad­min­is­tra­tion an­nounced Wednes­day it would re­duce air traf­fic by 10% across “high-vol­ume” mar­kets to main­tain trav­el safe­ty as air traf­fic con­trollers go un­paid and ex­hib­it signs of strain dur­ing the shut­down.