From a press release:

Boeing on Friday delivered Transaero’s first Next-Generation 737-800. The airplane, sporting a new livery, arrived at Moscow’s Domodedovo Airport.

Transaero’s newest 737 has a recognizable radome “bump” on top of the fuselage just behind the wings. The dome-shaped radome covers a Ku-band satellite antenna system that enables broadband passenger connectivity all over the world — even over oceans. The Ku-band range of microwave frequencies is used primarily for satellite communications.

Transaero’s 737-800 is the first in the 737 family to have the system installed during production. In-line installation can save airlines days of lost revenue previously experienced when retrofitting the radome after delivery.

Transaero was the first private airline in Russia, established in 1991. It also was the first Russian airline to introduce a Boeing airplane to its fleet in 1993 when it began operating the 737. Today, Transaero is the second-largest airline in Russia and operates 737s, 747s, 767s and 777s.