Theory:

Section I — Pan Am Flight 73
     It was the morning of September 5, 1986. The aircraft, Pan Am Flight 73 with 360 passengers on board, had just arrived from Mumbai and was ready to depart from Jinnah International Airport in Karachi for its destination — the United States. Unfortunately, the flight was hijacked by four heavily armed terrorists while it was parked at Karachi airport.
Explanation:
 
Many aspire to become engineers, doctors, IAS officers, film stars and so on. Just a limited number of people are service-oriented.
 
Self-sacrifice1.jpg
Self-sacrifice
  
This lesson, 'A Story of Self Sacrifice and Bravery', is about one such selfless, service-minded, brave human who lost her life at the great cost of saving others' lives. Her name was Neerja.
 
Neerja.jpg
Neerja
  
The incident took place on September 5th, 1986. On September 5th morning, the aircraft Flight 73 had just arrived from Mumbai. It was ready to depart from Jinnah International Airport in Karachi. It had 360 passengers on board. The plane's final destination was the United States. When the flight was parked at Karachi airport, suddenly, it was hijacked by four heavily armed terrorists.
 
Flight hijack.jpg
Flight hijack
 
Meaning of difficult words:
 
S.No
Words
Meaning
1.
Aspire 
To want to achieve something
2.
Destination
The place someone/something is going to reach
3.
Unfortunately
By bad luck
4.
Aircraft
A plane, helicopter, or other vehicles that fly
5.
Hijack To illegally take control of a vehicle, especially a plane
6.
Terrorist
Someone who uses violence
7.
Depart To leave a place to start a journey
8.
ArriveTo reach a place
Reference:
State Council of Educational Research and Training (2019). Term-3 English Standard-7. A Story of Self Sacrifice and Bravery (pp. 105-111). Published by the Tamil Nadu Textbook and Educational Services Corporation.