That’s brand new news to me. Just got back from
2 weeks in Hawaii. That might be a specific requirement of your airline. Didn’t do anything with any testing, just had to register and upload my vax card and travel information here:
https://travel.hawaii.gov/#/
You used to have to take a health survey within 24 hours of departure of the flight that takes you into Hawaii, but they just recently did away with that. Been to Hawaii and back 7-8 times in the past year, and once the vax was available, that was the end of the need to take a test within three days of travel.
Additionally, some airlines ask you to confirm that you do not have COVID, been exposed for x amount of time, etc., but do not require proof of such things (aka “honor system”).