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The Antonov An-225 by far.
It weighs 630,000 lbs empty (285,000 kg) and has a maximum take-off weight of 1.3 million lbs (640,000 kg).
An-225 with a 1.3 million pound takeoff weight
The maximum fuel capacity is 300 tonnes (about 410,000 litres), but it would rarely fly with full tanks since the fuel alone weighs about half of the maximum take-off weight of the aircraft.
One may find out information about the Antonov 225 via the 'Airlines' website, from watching YouTube videos posted on the Youtube website or by visiting the Wikipedia page for Antonov 225.
Its Antonov 225...
two
Jets come in many shapes and sizes, and there is not a one-size-fits-all answer for this question. The smallest production jet that I'm able to find stats on is the Eclipse 550 by One Aviation, with an empty weight of 3,634 lbs. and a maximum takeoff weight of 6,000 lbs. The world's largest jet aircraft is the Antonov An-225, with an empty weight of 628,317 lbs. and a max takeoff weight of 1,410,958 lbs. So, since I don't know which jet aircraft you had in mind specifically, you can figure it's going to be somewhere in between those figures.
The biggest aircraft ever built was the Antonov-225. With a length of 275.6 ft long, wingspan of 290 ft 2 inches and a maximum take off weight of 1,323,000 pounds. The AN-225 is clearly the largest plane ever built. http://en.wikipedia.org/wiki/An-225 For more Info.
The Antonov An-225
Antonov 225 Myria