ISS Flight Designations

• 'P' designations - Progress cargo flights.

  Progress cargo flights were given 'P' designations 1P, 2P... The first such flight was ISS mission 1P, which used Progress M1-3 launched on 2000 Aug 6. The most recent at this writing is ISS mission 87P, using Progress MS-26 launched on 2024 Feb 15.

  Note: NASA PAO will sometimes talk about "Progress 87" when they really mean "Mission 87P, Progress MS-26". Avoid propagating this solecism.

• 'S' designations - Soyuz crew ferry flights.

  Soyuz flights are given 'S' designations 1S, 2S.... Here is the matrix of S flights and the spacecraft they used.

  1S to 4S	Soyuz TM-31, TM-32, TM-33, TM-34
  5S to 23S	Soyuz TMA-1 to TMA-19
  24S	Soyuz TMA-01M
  25S	Soyuz TMA-20
  26S	Soyuz TMA-21
  27S	Soyuz TMA-02M
  28S	Soyuz TMA-22
  29S to 46S	Soyuz TMA-03M to TMA-20M
  47S to 70S	Soyuz MS-01 to MS-24

• 'R' designations - Russian flights on Russian rockets other than Soyuz and Progress The Russian-built, US-funded Zarya flight was thought of both 1A and 1R, and was given the designation 1A/R.

  ISS flight	Spacecraft	Launch vehicle
  1A/R	FGB (Zarya)	Proton
  1R	SM (Zvezda )	Proton
  2R	Redesignated 1S
  3R	MLM-U (Nauka)	Proton
  4R	SO-1 (Pirs)	Soyuz-U
  5R	MIM-2 (Poisk)	Soyuz-U
  6R	UM (Prichal)	Soyuz-2-1B

• 'A' (Assembly) designations - US ISS Assembly flights There was no '1A' flight - see '1A/R' above. Designations like 2A.1, 2A.2b reflect flights that were added to the sequence after the initial designations were assigned.

  ISS flight	STS Mission	Payload
  2A	STS-88	Node 1 (Unity)
  2A.1	STS-96	Spacehab
  2A.2a	STS-101	Spacehab
  2A.2b	STS-106	Spacehab
  3A	STS-92	Z1, PMA-3
  4A	STS-97	P6
  5A	STS-98	Lab (Destiny)
  5A.1	STS-102	MPLM, LCA, ESP-1
  6A	STS-100	MPLM, SSRMS
  7A	STS-104	AL (Quest)
  7A.1	STS-105	MPLM
  8A	STS-110	S0, MT
  9A	STS-112	S1
  10A	STS-120	Node 2 (Harmony)
  11A	STS-113	P1
  12A	STS-115	P3/P4
  12A.1	STS-116	Spacehab, P5
  13A	STS-117	S3/S4
  13A.1	STS-118	Spacehab, S5
  14A	Cancelled	(SPP)
  15A	STS-119	S6
  17A	STS-128	MPLM
  18A	Cancelled	(CRV)
  19A	STS-131	MPLM
  20A	STS-130	Node 3 (Tranquility), Cupola

• 'J' (Japanese) flights and 'J/A" (Japanese/Assembly) flights

  ISS flight	STS Mission	Payload
  1J	STS-124	JPM (Kibo)
  1J/A	STS-123	JLM (Kibo ELM-PS), SPDM (Dextre)
  2J/A	STS-127	Kibo EF, Kibo ELM-ES

• 'E' (European) flights

  ISS flight	STS Mission	Payload
  1E	STS-122	COF (Columbus)

• 'UF' (Utilization Flights), 'LF' (Logistics Flights), 'ULF' (Utilization and Logistics Flights) Considered cargo resupply flights rather than assembly flights, although the distinction appears really arbitrary.

  ISS flight	STS Mission	Payload
  UF-1	STS-108	MPLM
  UF-2	STS-111	MPLM, MBS
  LF-1	STS-114	MPLM
  ULF-1.1	STS-121	MPLM
  ULF-2	STS-126	MPLM
  ULF-3	STS-129	ELC-1, ELC-2
  ULF-4	STS-132	MIM-1 (Rassvet)
  ULF-5	STS-133	ELC-4, MPLM (PMM)
  ULF-6	STS-134	ELC-3
  ULF-7	STS-135	MPLM

• Flights with no designation

  The 9 Japanese HTV flights and 5 European ATV flights do not appear to have recieved ISS flight designations (one might have expected them to be 2J-10J and 2E-6E).

  Dragon and Cygnus flights did not get ISS flight designations.