Havana welcomed Biden’s move, with reservations.

The Change coalition are not the only ones with reservations about the deal - Marco Rubio, Trump’s pick for secretary of state, said in October that the deal posed a "serious threat" to US national security by giving the islands to a country allied with China.

The company asked those with reservations to check the status of their flights on alaskaair.com.

Can I wait at an entrance station and drive into the park if people with reservations don’t show up?

Privately, there were those in the DUP with reservations.