Source: Sharecast
As of 1314 BST, Dow Jones Industrials Average mini futures were falling by 345 points to 42,999, alongside a 55.25 point decline on the S&P 500 mini contract to 5,971.75.
Nasdaq-100 mini futures were off by 212 points to 21,486.50.
Shares of Boeing were in the spotlight following a catastrophic emergency landing by a South Korean Jeju Air 737-800 on Sunday whose landing gears failed to deploy after a bird strike.
Only two passengers survived.
The country's authorities ordered a "special safety inspection" of all Boeing 737-800s.
Nonetheless, budget airline Jeju was known to be the most heavily-fined carrier in South Korea since 2020. Reports also indicated that Jeju had pushed the aircraft involved in the incident hard before the accident.
On the economic calendar for Monday, at 1445 BST MNI will release its US Chicago Purchasing Managers' Index for December.
It will be followed a quarter of an hour later by the National Association of Realtors' Pending Home Sales Index and at 1530 BST by the Federal Reserve Bank of Dallas's regional factory sector index.
