There was a small mention in the CC about 30 units of Flyht's WVSS being installed in the UK for tests. Made me look for confirmation.
Found a website called wmo.int with a newsletter from April, 2021 that so states. In fact, Flyht's name, Tamdar and WVSS-II are bandied about quite a bit (although Flyht didn't own the WVSS-II at the time).
Some snips from this site for flavour...
https://community.wmo.int/activity-areas/aircraft-based-observations/newsletter/volume-21#article-9 Title: Monitoring and Assimilation Impact Study of ABO FLYHT Data at the Canadian Meteorological Centre
Introduction
The stabilization and potential expansion of the Canadian AMDAR program is being investigated through a contract with FLYHT Aerospace Ltd. for the provision of AMDAR data from First Air and Canadian North airlines. Approximately 50,000 observations from 11 Boeing 737 aircraft are received monthly. These observations are located mainly over the western sections of Canada and the province of Quebec (Figure 1). Most of the reports are below 400hPa during ascent and descent phases of flight which provide many temperature and wind profiles daily in data-sparse areas.
(the middle is for the enthusiasts)
Conclusions
This study has clearly demonstrated the importance of the First Air and Canadian North aircraft observations provided by FLYHT in the ECCC regional forecast system especially over southwest and northern Canada where most of the observations are located. The geographical coverage offered by these airlines fills in part an important data gap in Canada as demand is growing for more detailed and relevant information on real-time observations. Furthermore, the data’s impact, although small owing to the limited number of observations over Canada (11 aircraft), overall is positive. ABO are expected to continue to be important as more observations from these and other national airlines servicing additional airports in northern Canada and the Arctic expand and grow.
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In another section of the same newsletter...
ABOP Water Vapor Measurement, Global Water Vapor Measurement Summary
Operational Water Vapor Measurements (WVM) within the Aircraft Based Observations Programme (ABOP) continue to be sustained by the few participating Members implementing the Water Vapor Sensing System (WVSS-II). The current worldwide network of ABOP aircraft reporting WVM with WVSS-II remains at 148 which is unchanged since our last report in October 2020. While the COVID-19 pandemic has impacted the availability of data from WVM reporting aircraft, their accessibility has been notably higher in the U.S. where the network includes a diversity of aircraft types and airline partners. Despite the reduction in data quantities, these in-situ upper-air observations continue to be extremely valuable in all forecast operations, especially numerical weather prediction, and provide a significant contribution to the Global Observing System.
United Kingdom
While the plans have slowed due to the COVID-19 pandemic, the Met Office, UK intends to proceed with an initial implementation of 30 WVSS-II installations on UK-based aircraft starting in 2022/2023. These implementations are in support of the expansion of observations necessary for the Met Office Numerical Weather Prediction infrastructure upgrades. Programme approval has been granted and discussions with airline partners are currently underway.
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In the subsequent newsletter from November 2021, Flyht gets a lot of mention and a link to their site.
https://community.wmo.int/activity-areas/aircraft-based-observations/newsletter/volume-22#article-9 Snipped from this newsletter...
Availability and Impact of FLYHT Data
Following from the article in the Newsletter October of 2020 (Volume 20), an update is provided on the status of the data provision from FLYHT.
You will recall that we began receiving data from both the Automated Flight Information and Reporting System (AFIRS) and the Tropospheric Airborne Meteorological DAta Reporting (TAMDAR) system during April of 2020. Since then, the number of reporting aircraft has increased along with the associated data volumes.
FLYHT currently has 127 active TAMDAR and 195 active AFIRS-reporting aircraft (based on a September 2021 summary report) with the highest concentration of TAMDAR flights over North America and the greatest number of AFIRS over Asia. FLYHT has informed JET-ABO that there are plans to activate an additional 60 AFIRS-equipped aircraft over the next several months.
Flyht image from the report.
Another snip...
In summary, the data from FLYHT are supplementing the other ABO platforms as well as providing valuable information to regions where upper-air data is are sparse.
An endorsement from WMO...
We are pleased that FLYHT, Inc. has acquired the SpectraSensors (WVSS-II) production line from Endress Hauser and we look forward to soon learning more how this acquisition may impact that maintenance of the USA WVSS fleet and potential growth opportunities supported by the USA program.
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" There are currently 328 TAMDAR units installed on aircraft globally".
"The current worldwide network of ABOP aircraft reporting WVM with WVSS-II remains at 148".