April 22, 2021 he news comes after media reports said Singapore and Hong Kong had called off plans to announce the air travel bubble. The Straits Times and Reuters SINGAPORE - The date for the air travel bubble between Singapore and Hong Kong has yet to be fixed, said the Ministry of Transport (MOT) on Thursday (April 22). The news comes after media reports said Singapore and Hong Kong had called off plans to announce the air travel bubble on Thursday. The cancellation was initiated by the Singapore side, according to a Bloomberg report. In response to queries from The Straits Times, an MOT spokesman said that the two cities have been in close consultations on the travel arrangement, which was initially slated to take off in November last year.