Airlines are sharing contingency plans and options for ticketed passengers who may be impacted by shutdown-related flight reductions starting Friday.

The U.S. government shutdown has rattled air travel — most recently with an unprecedented effort from the Federal Aviation Administration to cut flights by 10% at airports nationwide.

Delta Air Lines says it plans to operate "the vast majority of our schedule," and to continue flying to all of the markets the airline serves, "though frequency may be affected."