The Biden administration had earlier permitted up to 30,000 people a month from these four countries to enter the US for two years with work authorization.
It had also convinced [Mexico](https://www.newsbytesapp.com/news/world/mexico) to agree to take an equivalent number back from the countries, given limited options for deportation.
However, Cuba usually accepted only about one deportation flight a month, while Venezuela and Nicaragua refused any.
Despite accepting many deportation flights, Haiti's continued chaos has complicated US efforts in this area.