This matter is simple to recognise the caused why the sudden hike of airport charges. It is because both Hyderabad and Delhi Airports are operated by MAHB
Delhi: http://www.malaysiaairports.com.my/index.php/component/content/article/194.html
Hyderabad: http://www.malaysiaairports.com.my/index.php/component/content/article/193.html
In Malaysia, we do recognise the sudden price hike with not good and valid reasons. This is why AirAsia is so angry with the drastic price hike without thinking the benefits of airlines bringing good revenue to the airport and the tourism industry. Therefore, I am not surprise with Delhi is hiking up their airport charges as the main department who make those decision are the same department running our airports in malaysia