https://www.gov.uk/government/consultations/harmonised-transition-altitude-proposed-plans
Harmonised transition altitude: proposed airspace plans - GOV.UK
Seeks views about plans for a harmonised transition altitude of 18,000 feet above sea level.
transition altitudeharmonisedproposedairspaceplans
https://www.alter-anniviers.com/
ALTER- Altitude Laboratory I Transition Experiments I Research
Jan 19, 2026 - ALTER- Trans-disciplinary Residency Program responding to the impact of environmental crises on communities in the Swiss Alps.
alteraltitudelaboratorytransitionexperiments