By Jamie Freed

(Reuters) – More airlines will avoid Ukraine’s airspace due to insurance concerns and a decision made by European leading carriers to end overflights following a U.S. warning about Russia invading at any moment, a flight operations advisory company said Monday.

KLM of the Netherlands stated that it would stop flights from Ukraine to and through Ukraine’s airspace. Lufthansa, Germany however, said they are considering suspensions.

British Airways (BA), which flew between London and Asia Monday, appeared to be avoiding airspace according to FlightRadar24’s monitoring.

On Sunday, a BA pilot stated on Twitter (NYSE : ) that freighter flights from London to Bangkok take longer due to “current geopolitics”. BA didn’t immediately respond to our request for comment.

Mark Zee founder of OPSGROUP, a flight operations advisory company. “My guess is that Ukraine will be unavailable pretty soon if we see over the weekend crystallises to a few more carriers actually pulling on the pin,” he said.

I don’t believe it’ll be government advice. It will instead be unavailability of insurance or carriers looking at alternative carriers. He said that if KLM, Lufthansa, and British Airways decide not to fly Ukraine, then we are almost back in an MH17 situation.”

Malaysia Airlines flight MH17 crashed over Eastern Ukraine in 2014 killing 298 people, two thirds of which were Dutch citizens. Some airlines already avoided the area after previous shoot-downs by military aircraft.

Zee stated that while the Ukraine-exclusion would be the most significant routing effect on carriers from neighboring countries, it wasn’t expected to increase the costs of long-haul flight.

SkyUp, a Ukrainian airline, said that it was forced to divert Saturday’s flight from Portugal to Ukraine because the owner of the plane had prohibited it from entering Ukrainian airspace.

Interfax Ukraine, a news agency reported that Ukrainian insurance companies received notification from their reinsurers that the airlines weren’t covered by war risk.

Denys Shmygal, the Prime Minister of Ukraine, stated Sunday that 16.6 billion Hryvnia (591.98 Million) was allocated by the government to flight safety. This is to allow insurance companies and leasing firms to continue flying through Ukraine’s airspace.

($1 = 28.0414 hryvnias)