The concept of providing parachutes for passengers on commercial airplanes has been discussed before, but it is not currently implemented for several practical and safety-related reasons. Here are some key factors to consider:

1. Aircraft Design and Safety Measures: Commercial airplanes are designed with multiple layers of safety features and systems to ensure the aircraft’s stability, control, and structural integrity. These safety measures, such as redundant systems, advanced avionics, and strict maintenance protocols, significantly minimize the likelihood of catastrophic failures that would necessitate a mass evacuation using parachutes.
2. Training and Familiarity: The proper and effective use of parachutes requires training and experience. Providing parachutes to passengers without proper training could potentially create more hazards and risks during an emergency situation. It would be challenging to ensure that every passenger on a flight is adequately trained in parachute usage and can handle the complexities and potential risks associated with deploying and using them.
3. Evacuation Challenges: In the event of an emergency situation requiring evacuation, deploying parachutes for every passenger and coordinating safe exits from the aircraft would be logistically complex and time-consuming. The process of distributing and securing parachutes, especially during high-stress situations, could hinder the efficient evacuation of passengers and delay rescue efforts.
4. Environmental Factors: The safety of parachute deployment is highly dependent on various environmental factors such as altitude, airspeed, wind conditions, and weather. These factors can change rapidly during a flight, making it challenging to ensure safe and effective parachute landings for passengers, especially in populated areas or over bodies of water.
5. Cost and Weight Considerations: Equipping every passenger with a parachute would significantly increase the weight of the aircraft, affecting fuel consumption, payload capacity, and overall operational efficiency. Additionally, the cost of acquiring, maintaining, and replacing a large number of parachutes for every flight would be considerable.

Instead of parachutes, the focus of aircraft safety is on prevention, early detection, and mitigation of risks through rigorous maintenance, training, and adherence to strict operational protocols. The aviation industry continually works to improve safety measures, including advanced emergency evacuation procedures, enhanced cabin materials, and improved aircraft designs, to ensure the highest levels of passenger safety in the unlikely event of an emergency.