What is clear-air turbulence and how was SQ321 affected?

Multiple analysts CNA spoke to believe Singapore Airlines flight SQ321 was hit by clear-air turbulence due to the sudden nature of the incident. Here's what we know about the phenomenon, and how it might have affected SQ321. More details: https://cna.asia/3KcR9Ya Subscribe to our channel here: https://cna.asia/youtubesub Subscribe to our news service for must-read stories: Telegram - https://cna.asia/telegram WhatsApp - https://cna.asia/whatsapp Follow us: CNA: https://cna.asia CNA Lifestyle: http://www.cnalifestyle.com Facebook: https://www.facebook.com/channelnewsasia Instagram: https://www.instagram.com/channelnewsasia Twitter: https://www.twitter.com/channelnewsasia TikTok: https://www.tiktok.com/@channelnewsasia