New York (JFK) and Boston (BOS) to London: JetBlue will finally hop the pond this summer from the Northeast. Passengers can choose from coach, Even More Space, or premium Mint service. The airline partnered with Dig and New York City's Delicious Hospitality Group to create in-flight menus with vegetable-forward meals, cheeky small-plate spins on British classics, and craft cocktails. Whether JetBlue will fly to Heathrow or Gatwick — and the official launch date — is yet to be announced.

Newark (EWR) to Dubrovnik (DBV): United will operate the only non-stop flights from the U.S. to Croatia, three times per week from Newark. Seasonal service will run from July 8 to October 3. 

New York (JFK) to Milan (MXP): Italy's second-largest airline, Neos Airlines, will make its U.S. debut with twice-weekly flights from the Big Apple to Italy's fashion capital. Neos boasts the youngest airline fleet in Europe and already operates 50 routes throughout Italy and countries in Africa, Asia, the Caribbean, and the Middle East. 

Boston (BOS), Chicago-O'Hare (ORD), and Newark (EWR) to Reykjavik (KEF): Starting in May, Delta Air Lines will launch daily service from Boston to Iceland's capital. On July 1, United will offer daily flights from Chicago and from Newark on July 3.

New York (JFK) and Washington-Dulles (IAD) to Athens (ATH): American Airlines begins daily seasonal service from New York to Greece on June 2. United will also offer daily seasonal service from the Nation's Capital from July 1 to October 3.

Seattle (SEA) to London-Heathrow (LHR): American Airlines started connecting the Pacific Northwest directly to the U.K. on March 27. Daily service is operated on its 777-200 aircraft.