Think this might be the case as that's the date Cuba was given SST status by Trump, but it's not 100% clear on the DHS website whether that date applies. I've gone back to the agents organising our trip and asked them to confirm...
Thanks for posting - wasn't aware of this. Went to Cuba about 4 years ago and have some travel booked for next year that includes some time on US soil (part of a cruise) so will need to look into this. Luckily I'm not doing the 3-4 times a year or more work trips I used to have to do :smile: