Due to different operational conditions in Europe many countries (particularly those known for low visibility conditions) were expected to embrace the MLS system as a replacement to ILS. However, in reality the only major installation was London Heathrow Airport, which was decommissioned on the 31st of May 2017. Other major airports, such as Frankfurt Airport which were expected to install MLS have instead published ground-based augmentation system (GBAS) approaches.[8]