As one of the oldest and largest airlines in the United States of America, the US domestic market is an important piece of the puzzle for Delta Air Lines. The scale of its internal operations is underlined by the fact that it uses widebody aircraft on select routes, despite them typically serving long-haul corridors.

According to scheduling data made available by Cirium, an aviation analytics company, Delta Air Lines has scheduled a grand total of 2,561 domestic widebody flights this month, representing a 9.8% increase compared to its figure of 2,332 in December of 2024. These will offer 590,705 seats, up 8.8% year on year, and be operated by six different aircraft types from three families. Let’s dive deeper into the data and examine the top routes.

The Boeing 767 Is The Dominant Aircraft Family

Of this month’s 2,561 domestic widebody flights at Delta Air Lines, 1,962 are set to be flown by jets from the Boeing 767 family. This figure is split between 189 with the 767-400ER and 1,773 with the 767-300ER. The former model’s top internal route this December links Atlanta (ATL) with New York (JFK) on a daily basis, with Miami (MIA) and Los Angeles (LAX) served almost as frequently from Atlanta, with 28 and 26 rotations respectively.

As for the more numerous 767-300ER (Delta has 39 compared to 21 767-400ERs, according to ch-aviation), the type can most frequently be found on the transcontinental corridor between New York JFK and Los Angeles, with 208 outbound and 209 inbound flights scheduled (6.7 a day on average). Going forward, Delta has big plans for the in-flight entertainment offering on board its Boeing 767-300ER jets, and explained just last week that:

« Delta Sync seatback is currently rolling out across our Boeing 737-800 fleet. Beginning next year, it [will come] on board the 767-300 and A350-900, bringing the experience to widebody planes for the first time. »

What About The Airbus A330?

All of Delta’s remaining domestic widebody flights this month will use Airbus jets, with the vast majority of these being served by three models from the A330 series. From the first-generation A330ceo family, the smaller A330-200 accounts for 73 flights, with most of these (30 outbound and 29 inbound) coming on the JFK-LAX transcontinental corridor. The type also flies from Atlanta to Orlando (MCO) and JFK to Salt Lake City (SLC).

The A330-300 from the A330ceo series is the top Airbus variant by frequency when it comes to Delta’s domestic widebody operations this month, accounting for a grand total of 401 flights. In addition to flying daily between LAX and JFK, this model is also used once a day on flights from Atlanta and Minneapolis (MSP) to Honolulu (HNL), where, owing to its remote western location in the Pacific, the type’s range is as important as its capacity.

Of course, recent years have also seen Delta Air Lines modernize its widebody fleet with the addition of 39 A330-900s from the new A330neo series, which, according to ch-aviation, are just 3.1 years old on average, making them the carrier’s youngest twin-aisle jets. This month, they account for 38 domestic flights, with Phoenix (PHX) to Atlanta being the dominant corridor (15 round trips). They also serve Detroit (DTW) and Tampa (TPA).

Domestic Deployments Are Rare For The Airbus A350

Delta’s sixth and final widebody twinjet design that will see domestic deployments this December is the Airbus A350-900. These new jets are 5.3 years old on average, and, in addition to the 39 examples of the type that Delta already has in its fleet, there are also five more (plus 20 A350-1000s) on order.

This December, the A350 accounts for 87 of Delta’s domestic services, with 66 (34 outbound and 32 inbound) found on the route between Atlanta and Los Angeles. Elsewhere, the type will serve two round trips from Atlanta to Salt Lake City and Honolulu (plus a third inbound departure on the former route), with one-off returns from Atlanta to Detroit, Minneapolis, Orlando, and Phoenix, LAX to Detroit, and Minneapolis to LAX and Salt Lake City.