Trump's travel ban is officially in effect — here's what's happening at airports around the US

After the US Supreme Court agreed to hear arguments for Trump's revised travel ban, justices implemented a partial stay and removed the lower courts' injunctions that initially blocked the ban.

Now some people from six majority-Muslim countries will face restrictions on travel to the US.

The Trump administration's revised ban went into effect at 8 p.m. ET on Thursday, banning entry by people from Iran, Libya, Somalia, Sudan, Syria, and Yemen for 90 days and by almost all refugees for 120 days. Exceptions include those who were already issued a valid visa or who have "credible claim of a bona fide relationship with a person or entity in the United States."

Extended-family members like grandparents, grandchildren, aunts, uncles, nieces, nephews, and cousins may not claim a "close familial relationship" and are therefore not exempt, according to the State Department's website. People engaged with someone residing in the US were initially excluded, but the government changed course when the ban took effect and allowed for their exemption.

Minutes before the ban went into effect, Hawaii, one of the states where a federal court previously struck down a version of the travel ban, filed a court challenge to the Trump administration's definition of this relationship, the Associated Press reported.

In response to the Supreme Court's injunction lift, protesters and immigration advocacy groups participated in demonstrations at airports across the US — but not with the same intensity as the protests that took place in January after Trump's initial travel ban went into effect.

Airports were mostly calm as the ban took effect Thursday, a stark difference from the chaotic implementation of the first version of the ban in late January.

Trump's executive order establishing the first iteration of the travel was signed on January 27. It was implemented suddenly and without guidance from the Justice Department, however, and it sparked confusion after travelers with preapproved visas were barred from entering the US.

With the revised travel ban, immigration officials were told not to deny entry to anyone with valid travel documents, according to the Associated Press.

"There's a very small class of people that the ban could now apply to," said Regina Jefferies, a clinical teaching fellow at the University of Minnesota Law School.

"We don't really expect that we will see the same type of chaos that happened with the first ban rollout and some of that implementation, simply because most of the deciding, who and who will not be subject to the ban, will happen outside of the US."