Right Now, The Second-Most Tracked Aircraft In The World Is A Russian Wide-Body -- October 8, 2022

Link here. A dynamic link.

Seattle.

The largest a/c, the Antoonov An-225 Mriya mentioned below was destroyed in Ukraine during the current skirmish. Link: https://www.fox10phoenix.com/news/worlds-largest-plane-antonov-an-225-destroyed-in-ukraine-russian-conflict.  On or about February 27, 2022.

From wiki.

The Antonov An-124 Ruslan (Ukrainian: Ан-124 Руслан; Russian: Антонов Ан-124 Руслан, lit. 'Ruslan'; NATO reporting name: Condor) is a large, strategic airlift, four-engined aircraft that was designed in the 1980s by the Antonov design bureau in the Ukrainian SSR, then part of the Soviet Union (USSR). 

The An-124 is the world's 2nd heaviest gross weight production cargo airplane and heaviest operating cargo aircraft, behind the destroyed one-off Antonov An-225 Mriya (a greatly enlarged design based on the An-124) and the Boeing 747-8. 

The An-124 remains the largest military transport aircraft in service. The lead designer of the An-124 (and the An-225) was Viktor Tolmachev.

During development it was known as Izdeliye 400 (Product #400) in house, and An-40 in the West. First flown in 1982, civil certification was issued on 30 December 1992. In July 2013, 26 An-124s were in commercial service with 10 on order.

In August 2014, it was reported that plans to resume joint production of the Antonov An-124 had been shelved due to the ongoing political tensions between Russia and Ukraine. 

The sole remaining production facility is Russia's Aviastar-SP in Ulyanovsk. The various operators of the An-124 are in discussions with respect to the continuing airworthiness certification of the individual An-124 planes. The original designer of the An-124 is responsible for managing the certification process for its own products, but the Russia-Ukraine conflicts are making this process difficult to manage. 

In 2019, there were 26 An-124s in commercial service.