My son and daughter are visiting us at Kuala Lumpur. Both have a student visa for 5 years starting 2011 and 2013. Both hold Indian Passports. Both have long term residence pass expiring in 2022 for Malaysia. They will arrive from Dallas to Heathrow at Terminal 5 at 0725 hours by British Airways and leave at 1050 hours from Terminal 4 by Malaysian Airlines direct flight to Kuala Lumpur the same day (which means a transit time provided both flights keep their timings of around 3 and a half hours). They last entered US in August 2013 and have been there till this travel which would be a stay more than 6 months in USA since last entered there. Do they need a Transit Airside Visa.