Either one is correct. Meaning is subtly different, but not much.
A later sentence in the article is formed similarly and correctly uses "as" - "The runway also 'melted' at the RAF Brize Norton, military air base in Oxfordshire, west of London, on Monday as the UK struggled to cope with the weather."
I think this matters because some people on hackernews are not native English users. They may be legitimately confused or misled by typos that a native speaker would unconsciously correct.