Malindo Air:
• 6-month validity travel voucher to be used within 1 year https://www.malindoair.com/news-events/Malindo-Air-COVID-19-Travel-Waiver-Permitted
Firefly:
• change travel date
• 90-day validity travel voucher https://www.fireflyz.com.my/covid19-my 
Singapore Airlines & SilkAir:
• flight credit (with bonus) to be used by 30 June 2021
• refund

https://www.singaporeair.com/en_UK/sg/media-centre/news-alert/
Qantas:
• flight credits to be used by 30 April 2020 & travel by 31 December 2021

https://www.qantas.com/au/en/travel-info/travel-updates/coronavirus.html
Turkish Airlines:
• change your flight date
• change to open ticket

https://www.turkishairlines.com/en-my/announcements/coronavirus-outbreak/flexible-change/
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