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In page Tupolev Tu-144:

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  • Tu-144DA – A project study, assigned the number Tu-144DA, increased the wing area and the take-off weight, and replaced the engines with the RD-36-61 which had 5% more thrust. The Tu-144DA increased fuel capacity from 98,000 kg to 125,000 kg with a higher maximum certified take-off weight (MCTOW) of 235,000 kg. and range up to 7,500 km (4,700 mi).[2]
  • Tu-144LL – One Tu-144D aircraft (СССР-77114 [c/n10082]) converted to a flying laboratory with four Kuznetsov NK-321 afterburning turbofan engines and re-registered RA-77114. The first flight took place on 29 November 1996 with the 27th and last flight on 14 April 1999.[citation needed]