Severe weather systems hovering over the European continent spawned unfavourable flying conditions on its vast area's airport terminals, including London's Heathrow Airport where two Qantas Airways flights coming and bound for the terminal are suspended on Wednesday.

Qantas spokeswoman Olivia Wirth announced today that while seven of its flights would fly as scheduled, with three planes originating from Heathrow, two flights, QF29 and QF30 would take a while before they reach their purported destinations.

Heavy snowfall forced the London airport to operate only on one runway that left many flights cancelled, including that of the QF30, while incoming planes would be delayed that forced the QF29 flight from Melbourne to lay over for a much longer time in Hong Kong.

This early, Qantas has issued advisory that the weather disturbance could bring about more delays or even cancellations as Wirth admitted that the airline is witnessing the occurrence of severe delays across the system.

However, the national carrier is also offering refunds and rebooking options for passengers affected by the weather-induced delays as the company spokeswoman noted that "it's a horrible situation that's affecting all airlines."

As of last checking, thousands of passengers remain marooned at Heathrow as thick snow blanketed the British capital that prevented flights from both taking off and touching down, causing an almost global flight disturbance.

Most of the trapped passengers are left to wait out the storm and delays at airport terminals waiting for replacement flights which British authorities said could last until Christmas day despite the reopening of Heathrow's southern runway.

Critics, including the European Union slammed Heathrow Airport authorities for the chaotic situation and blamed the airport management for being ill-prepared in dealing with the issues brought by the extreme weather situation.

British Prime Minister David Cameron vowed for an inquiry as he reminded the public that the weather is so severe that the delays and inconveniences are almost inevitable but he admitted frustrations that the situation is taking too long to improve.