Thai plane violation of Cambodia's airspace was due to dark clouds: Is Thailand still flying antiquated WWI-era spy planes?

Is this the type of spy planes used by Thailand? Is this why it can't tell it violated Cambodia's airspace under dark cloud cover?

Cambodia warned Thailand for violating Cambodia’s airspace

August 18, 2009
Source: ABC Radio Australia
Translated from Khmer by Heng Soy for KI-Media

On Monday, a group of Cambodian officials issued a new warning on the violation of Cambodia’s airspace by Thai planes. The officials indicated that, in the future, these airplanes will no longer be lucky as they were in the past if they continue to violate Cambodia’s airspace. The following is Khemara Sereyrath’s report from Phnom Penh:

This is a new reminder issued to Thailand, in spite of the fact that Thailand sent in a written clarification regarding its airplane flying into Cambodia’s airspace in Pailin province at the end of last week.

Koy Kuong, spokesman of the Cambodian ministry of Foreign Affairs, indicated that Cambodia just received the official apology letter explaining the violation of Cambodia’s airspace [by Thai plane]. In its explanation, Thailand claimed that the violation was due to the presence of dark clouds, that was why the plane violated Cambodia’s airspace, and Thailand also claimed that this technical mistake was due to the fact that maps were not consulted properly only.

Nevertheless, Koy Kuong expressed Cambodia’s concerns for the pilot’s safety, because of this lack of attention, the pilot could face danger when he violates Cambodia’s airspace again in the future.