References 479% CONFIDENCEOverall confidence: 79%How well the pin's source and references back up its dates.Weighted average of how firmly 4 references, the source included, support the pin's start and end times; a reference counts half as much for every 180 days older than the newestShow all pins at 75% confidence or better

The first entry is always the pin's source. Overall confidence is a weighted average of how firmly each reference supports the start and end times used above; a reference counts half as much for every 180 days older than the newest.

• [1]90%
  widebodyaircraft.nl/chro1991.htm

  widebodyaircraft.nl· Posted Oct 26, 2026· Starts May 4, 1993 ✓· 25% of score

  The Widebody Aircraft Chronology lists "May 4, 1993: First flight of the Boeing 747-400F (Freighter)" and Wikipedia^[2] states "The model's first flight was on May 4, 1993"; boeing-747.com^[4] says May 1993. No source opened names the airfield.

• [2]75%
  Boeing 747-400 - Wikipedia

  en.wikipedia.org· Added Oct 26, 2026· 25% of score

  States the 747-400F first flight on 4 May 1993, entry into service with Cargolux^[3] on 17 November 1993, payload and customers.

• [3]80%
  1990 - 1999 (Cargolux 50th anniversary)

  anniversary.cargolux.com· Added Oct 26, 2026· 25% of score

  Cargolux's own history: order on 5 December 1990, first 747-400F LX-FCV delivered in November 1993.

• [4]70%
  Boeing 747 Family (boeing-747.com)

  boeing-747.com· Added Oct 26, 2026· 25% of score

  Says the 747-400F first flew in May 1993 and entered service with Cargolux^[3] that November; 126 built.

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