The expansion of Indian airlines has had several impacts on the environment. Some of the significant impacts are:

• Increased air pollution: The rise in the number of airlines has led to a significant increase in air traffic, leading to higher fuel consumption and air pollution. The burning of fossil fuels by aircraft releases harmful greenhouse gases into the atmosphere, leading to air pollution and the depletion of the ozone layer.
• Noise pollution: The expansion of the airlines has brought along an increase in the number of aircraft, leading to the generation of more significant noise levels that can cause hearing problems and stress-related health issues.
• Habitat destruction: The expansion of airport facilities has caused the destruction of natural habitats, leading to the displacement of wildlife and loss of biodiversity.
• Climate change: The increase in air traffic has led to a rise in the carbon footprint, leading to climate change, which is detrimental to the environment. The increase in temperature and rise in sea levels lead to extreme weather conditions and natural calamities.

Therefore, it's crucial to monitor the expansion of airlines and take necessary steps towards sustainable growth, minimizing the impact on the environment.