I bought a 1-way ticket from Punta Cana home to Canada, surprise, when I got to the lineup at the airport Sunwing charges a 20 USD airport tax separately. I was told I should have known, though it is the only airline in the terminal that charges it (separately, USD only, no cards or local currency accepted). ATMs at the airport out of service, nowhere to purchase USD on-site. Local banks do not sell you USD if you don't have an account with them... Eventually I found a taxi driver to buy the currency from. Luckily I speak Spanish and am comfortable in the country on my own. I was able to find a solution as the Nexus greeter for Sunwing offered no help. Other Sunwing team members and flight crew I met later were much more helpful when I could not complete self-check-in (flying with carry-on only) as all the seats were locked and apparently could only be assigned at the desk (despite the greeter telling me to use the self-check-in).