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What (who) is PSA - definition
WIKIMEDIA DISAMBIGUATION PAGE
Psa; PSA (disambiguation); P.S.A.; PS A
![phalanx]] (long thin arrow). There is synovitis at the proximal interphalangeal joint (long thick arrow) plus increased signal in the overlying soft tissues indicating [[edema]] (short thick arrow). There is also diffuse bone edema (short thin arrows) involving the head of the proximal phalanx and extending distally down the shaft.](https://commons.wikimedia.org/wiki/Special:FilePath/Psoriatic arthritis digit ar1934-2.gif?width=200 "phalanx]] (long thin arrow). There is synovitis at the proximal interphalangeal joint (long thick arrow) plus increased signal in the overlying soft tissues indicating [[edema]] (short thick arrow). There is also diffuse bone edema (short thin arrows) involving the head of the proximal phalanx and extending distally down the shaft.")
![axial]] (a) pre-contrast and (b) post-contrast images exhibiting [[dactylitis]] due to [[flexor]] [[tenosynovitis]] at the second finger with enhancement and thickening of the [[tendon sheath]] (large arrow). Synovitis is seen in the fourth proximal interphalangeal joint (small arrow).](https://commons.wikimedia.org/wiki/Special:FilePath/Psoriatic arthritis dactylitis ar1934-4.gif?width=200 "axial]] (a) pre-contrast and (b) post-contrast images exhibiting [[dactylitis]] due to [[flexor]] [[tenosynovitis]] at the second finger with enhancement and thickening of the [[tendon sheath]] (large arrow). Synovitis is seen in the fourth proximal interphalangeal joint (small arrow).")
![spine]] in psoriatic arthritis. Signs of active inflammation are seen at several levels (arrows). In particular, [[anterior]] spondylitis is seen at level L1/L2 and an inflammatory [[Andersson lesion]] at the upper vertebral endplate of L3.](https://commons.wikimedia.org/wiki/Special:FilePath/Psoriatic arthritis spine ar1934-6.gif?width=200 "spine]] in psoriatic arthritis. Signs of active inflammation are seen at several levels (arrows). In particular, [[anterior]] spondylitis is seen at level L1/L2 and an inflammatory [[Andersson lesion]] at the upper vertebral endplate of L3.")
![Magnetic resonance images of [[sacroiliac joint]]s. Shown are T1-weighted semi-coronal magnetic resonance images through the sacroiliac joints (a) before and (b) after intravenous contrast injection. Enhancement is seen at the right sacroiliac joint (arrow, left side of the image), indicating active [[sacroiliitis]].](https://commons.wikimedia.org/wiki/Special:FilePath/Sacroiliitis MRI ar1934-5.gif?width=200 "Magnetic resonance images of [[sacroiliac joint]]s. Shown are T1-weighted semi-coronal magnetic resonance images through the sacroiliac joints (a) before and (b) after intravenous contrast injection. Enhancement is seen at the right sacroiliac joint (arrow, left side of the image), indicating active [[sacroiliitis]].")
PSA
Python Software Activity (Reference: Python)
Pacific Southwest Airlines
![[[US Airways]] [[Airbus A319]]<!-- painted--> in PSA's livery (note: PSA never operated Airbus aircraft)](https://commons.wikimedia.org/wiki/Special:FilePath/Airbus A319-112 (1-12-2023).jpg?width=200 "[[US Airways]] [[Airbus A319]]<!-- painted--> in PSA's livery (note: PSA never operated Airbus aircraft)")
![[[Lockheed L-188 Electra]] of PSA around 1959](https://commons.wikimedia.org/wiki/Special:FilePath/PSA Electra, circa 1960s.jpg?width=200 "[[Lockheed L-188 Electra]] of PSA around 1959")
![Boeing 737-200]] with the “smiling” livery in 1984](https://commons.wikimedia.org/wiki/Special:FilePath/Pacific Southwest Airlines B-737 N379PS.jpg?width=200 "Boeing 737-200]] with the “smiling” livery in 1984")
![PSA smile on a<br />[[Lockheed L-1011 TriStar]]](https://commons.wikimedia.org/wiki/Special:FilePath/Pacific Southwest Airlines L-1011 N10114 1.jpg?width=200 "PSA smile on a<br />[[Lockheed L-1011 TriStar]]")
![Passengers boarding a<br />[[Boeing 727]] in 1971](https://commons.wikimedia.org/wiki/Special:FilePath/Passengers queue to board airplane in rainy weather, 1971.jpg?width=200 "Passengers boarding a<br />[[Boeing 727]] in 1971")
AIRLINE
PSA Inc.; Pacific Southwest Airlines Inc.; Padfic Southwest Airlines; Pacific Southwest Airlines-PSA; PSA Magazine; Pacific Southwest Airlines Inc; Pacific Southwest Airlines, Inc.; Pacific Southwest (airline)
Pacific Southwest Airlines (PSA) was a United States airline headquartered in San Diego, California, that operated from 1949 to 1988. It was the first large discount airline in the United States.
Examples of use of PSA
1. "PSA International confirms that it has made an approach to The Peninsular and Oriental Steam Navigation Company (P&O)," a PSA statement said, without providing details.
2. The other PSA projects are operated by Exxon and Total.
3. "The investigation can result in one of two decisions –– either the PSA will be rejected or we can negotiate to change the PSA," he said.
4. PSA has no production facilities in country yet. (Reuters, Bloomberg) «
5. The trades union reacted strongly to the PSA attack.