AoT backs rebirth of Don Muang - Old airport to service some domestic routes
Bangkok Post - AMORNRAT MAHITTHIROOK

The board of Airports of Thailand Plc yesterday approved the use of Don Muang for domestic flights with no international connections and set March 15 as the possible date for the relaunch of services at the old airport.

In an attempt to save costs from expanding Suvarnabhumi airport and to fully use its existing infrastructure, the board led by chairman Gen Saprang Kalayanamitr decided to move to Don Muang domestic flights with no connections to international routes operated by Thai Airways International (THAI) and no-frills carriers. Domestic flights with passengers connecting with international routes will remain at Suvarnabhumi.

It targeted March 15 for the resumption of regular services for Don Muang, which was closed on Sept 28, when the country's main airport moved to Suvarnabhumi.
The March 15 date was set to allow sufficient time to prepare for an expected surge in air travel to the provinces during the Songkran holiday. Sources in the Airports of Thailand (AoT) board said its president Chotisak Asapaviriya told the meeting that the March 15 move was possible. However, he told reporters afterwards that he could not guarantee complete success.

The decision was based on a study by AoT to compare the advantages and disadvantages of expanding Suvarnabhumi against relocating domestic services to Don Muang. The use of Don Muang to ease air traffic at Suvarnabhumi would give officials more flexibility to fix a number of problems at the new airport, sources said. Mr Chotisak said the board has directed AoT to work on the details of the use of Don Muang and forward them to the Transport Ministry _ which oversees the airport agency _ within two weeks. After that the ministry, which has already made clear its preference for Don Muang, needs cabinet approval for the plan.

Based on the current volume of passengers, Suvarnabhumi will serve 42 million passengers a year, just three million shy of its full capacity.

Full article: http://www.bangkokpost.net/News/12Jan2007_news01.php

Sounds like a lot of traffic would go to and from Suvarnabhumi to Dom Muang as many travel on an International airline and switch to a Budget Domestic one and vice versa.