"The AoT will need to have an acceptable reason if it says it's facing losses from collecting the charge," Mr Chatchart said on Tuesday. "The AoT is still making profit and it's necessary for us to look at the big picture."
The minister said officials will have to consider whether the proposed service charge is sustainable, given that budget carriers are now selling airfares for as little as 1,500 baht return. If passengers have to pay 200 baht service charges, it could reduce passenger traffic, he said.
The minister said airports that want to raise the passenger service charge must submit a proposal to the authorities first, adding that the charges do not have to be uniform accross all airports, since different locations have different operating costs.
According to sources, the AoT earns about 16 billion baht of revenue from current passenger service charges annually. If the charge were increased as proposed, the AoT would earn 38 billion baht.
Last week, AoT Chairman Sita Divari said the AoT board of directors had agreed on the need to raise airport departure taxes for both domestic and international passengers by 100 baht.
Mr Sita said departure taxes on domestic flights would rise from 100 to 200 baht and from 700 to 800 baht on international flights.
According to the AoT, passenger traffic through Thailand's six main airports showed robust growth in the fiscal year to last month, climbing 20.4% from the previous year to 86.13 million travellers, both domestic and international.
The number of flights through these airports increased by 16.5% to 559,397 during the same period.
Suvarnabhumi, the country's gateway airport, continued to dominate traffic volume with 50.90 million passengers and 287,997 flights, accounting for 59% of overall passenger numbers and 51.5% of all take-offs and landings.
It was followed by Bangkok's second airport Don Mueang, which largely serves discount airlines, with 15.56 million passengers and 135,976 flights.
Phuket airport recorded 10.98 million passengers with 70,198 flights.
Chiang Mai had 5.17 million passengers and 41,295 flights, while Hat Yai had 2.47 million passengers and 17,056 flights, and Chiang Rai 1.05 million passengers and 6,882 flights.
Suvarnabhumi is served by 107 international airlines. The airport connects Bangkok with more than 150 cities around the world.
The top five nationalities of tourists arriving through Suvarnabhumi are Chinese, Japanese, Indian, South Korean and Russian.