Table:
0
A
B
C
D
E
1
City
Country
IATA
ICAO
Airport
2
Bayda
Libya
LAQ
HLLQ
La Abraq International Airport
3
Benghazi
Libya
BEN
HLLB
Benina International Airport
4
Rabat
Morocco
RBA
GMME
Rabat-Sale Airport
5
Istanbul
Turkey
IST
LTBA
Atatürk International Airport
6
Sabha
Libya
SEB
HLLs
Sebha Airport
7
Tobruk
Libya
TOB
HLGN
Tobruk Airport
8
Tripoli
Libya
TIP
HLLT
Tripoli International Airport
9
Tunis
Tunisia
TUN
DTTA
Tunis–Carthage International Airport

Questions and formulas:
Question: What is the IATA code for the airport with an ICAO code of HLLS?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="hlls"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,D2:D9="hlls"),3))
Level: medium
Question: What airport is in Sabha?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="sabha"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,A2:A9="sabha"),5))
Level: medium
Question: What is the ICAO code for the airport with RBA as its IATA code?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="rba"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,C2:C9="rba"),4))
Level: medium
Question: What country is Istanbul in?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="istanbul"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,A2:A9="istanbul"),2))
Level: medium
Question: Which airport has SEB as its IATA code?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="seb"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E9,C2:C9="seb"),5))
Level: medium