It sounds crazy, but next year, millions of Americans might have to start using passports to fly -- on domestic flights.
A decade ago, the U.S. government issued stricter standards for state-issued IDs, including drivers licenses. But four states have refused to comply: Louisiana, Minnesota, New Hampshire and New York.
The deadline for upgrading is coming up in 2016. If those four states don't upgrade their ID systems by the deadline, the TSA will demand that residents of those four states use passports rather than drivers licenses to board flights next year. About 9.5 million drivers licenses have been issued in those states, according to government licensing records.
It's possible that fewer people will be impacted if states take action soon. States have desperately begged for extensions. Minnesota didn't get one.
"As soon as January 2016, Minnesotans may not be allowed to board federally-regulated commercial aircraft using a Minnesota driver license or ID card," the state's public safety department told CNNMoney.
Two states were granted temporary waivers just this Tuesday, and now they're scrambling to pass new laws, make new cards and issue them to the public.
The stricter ID standards are already being enforced elsewhere. Recently, people with New Hampshire drivers licenses have been turned away from federal buildings in Washington, according to New Hampshire licensing officials.
The TSA will accept $55 passport cards and $135 passport books as valid ID.
What does the law state?
Following recommendations of the 9/11 Commission, President Bush signed into law the REAL ID Act in 2005. The law made fake IDs harder for criminals to obtain.
The REAL ID Act forces all U.S. states and territories to demand more proof of identity when issuing IDs, such as a verified original copy of a person's birth certificate. Plus, it also increases the technology present in the government-issued cards.