Here are the release dates of all ships in Elite

December 16th 2014 – Initial Game Release
Adder
Anaconda
Asp Explorer
Cobra Mk III
Eagle
Federal Dropship
Hauler
Imperial Clipper
Orca
Python
Sidewinder
Type-6 Transporter
Type-7 Transporter
Type-9 Heavy
Viper MK III
March 10th 2015 – 1.2 "Wings"
Fer-de-Lance
Vulture
June 5th 2015 – 1.3 "Powerplay"
Imperial Courier
Diamondback Scout
Diamondback Explorer
October 6th 2015 – 1.4 "CQC"
Imperial Eagle
Federal Gunship
Federal Assault Ship
December 15th 2015 – 2.0 "Planetary Landings" & 1.5 "Ships"
Asp Scout
Cobra Mk IV
Federal Corvette
Imperial Cutter
Keelback
Viper Mk IV
SRV – Scarab
October 25th 2016 – 2.2 "The Guardians" & 1.7
Beluga Liner
F-63 Condor
Imperial Fighter
Taipan
April 11th 2017 – 2.3 "The Commanders"
Dolphin
December 20th 2017 – 2.4 "The Return"
Type-10 Defender
February 27th 2018 – 3.0 "Beyond Chapter One"
Alliance Chieftain
June 28th 2018 – 3.1 "Beyond Chapter Two"
Alliance Challenger
Krait Mk II
August 28th 2018 – 3.2 "Beyond Chapter Three"
Alliance Crusader
XG7 Trident
XG8 Javelin
XG9 Lance
December 11th 2018 – 3.3 "Beyond Chapter Four"
Krait Phantom
Mamba
December 9th 2021 – Update 9 "Odyssey"
SRV – Scorpion