Theory:

Meaning of difficult words from the lesson "A Story of Self Sacrifice and Bravery"':
 
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
9.
Intention
A plan in mind to do something
10.
Hide
To put something in place so as not to be seen 
11.
Discard
To throw something away  
12.
Confront
To deal with a difficult situation
13.
CalamityA serious event or accident causing damage or suffering
14.
MandateTo give official permission for something to happen
15.
Nightmare
A frightening or difficult situation
16.
Frustration
An annoyed feeling of someone when prevented to do something
17.
Hesitation
A pause or feeling before saying or doing something
18.
Assist
To help someone or something
19.
Selfless
Refers to the act of thinking more for the needs and concerns of others than one's own.
20.
GrenadeA small bomb thrown by hand or a bullet fired from gun
21.
Explosive A chemical substance that undergoes a rapid chemical transformation when heated or struck
22.
Chaos A state of confusion
23.
Leapt To move suddenly and quickly
25.
Evacuate To move from a dangerous place to somewhere safe
26.
Exit
An act of leaving a place
27.
Rescue
To save someone from a dangerous situation
28.
Wound
A serious injury in which your skin is cut or damaged 
29.
InflictTo cause something unpleasant
30.
FatalCausing death or bad result
31.
Eventually Finally or at the end after a long period
32.
Succumb To die from the effect of an injury
33.
FateThings happen to someone, especially unpleasant
34.
JournalistA person who works for a newspaper, magazine, television show, or radio programme
35.
Longed-for
Wanted or hoped very much for a long time
36.
Take off
Successful or popular
37.
Disaster
An event resulting in great loss or a lot of damage
38.
Sour
Refers to bad, unfriendly or unpleasant thing
39.
Spirit
Refer to the positive attitude of someone
40.
Dowry
Refers to money, jewels, property etc., that a bride's family offers to the bridegroom
41.
Attendant
Someone whose job is to be in a particular place and help customers or visitors
42.
Peer
Someone who has the same age, status, or abilities as the other members of a community
43.
Purser
Refers to a person in a ship or a plane who takes care of passengers
44.
Accomplishment
Something that is achieved after a lot of hard work
45.
Loyalty
The quality of being constant in your support
46.
Distress
A feeling of unhappiness or sadness
47.
Tribute
A statement or an award intended to show respect for a person's accomplishments
48.
Bravery A quality of facing danger without any fear
49.
Acknowledge To recognise something
50.
Posthumously After death
51.
Crew
A group of people who work together especially on a ship, plane etc.
52.
Suburb
An area on the edge of a large town or a city
53.
Hypothetical
Imagined or suggested situation and not true
54.
Sensitive 
A situation needed to be dealt with care
55.
Coward
Someone who is not brave enough to face danger
56.
Affectionate
Showing love and care about someone or something
57.
Principle
A basic idea or a rule that serves as a foundation for a system or belief
58.
Inner strength
Great will power
59.
Board
To allow people to get onto a boat, aircraft etc.
60.
Intention
Something you want or plan to do
61.
Admit
To agree that something is true
62.
Afraid
Feeling fear or worry about the results of something