Table:
0
A
B
C
D
E
1
AIRLINE
ICAO
IATA
CALLSIGN
COMMENCED OPERATIONS
2
Air Busan
ABL
BX
AIR BUSAN
2008
3
Air Incheon
AIH
KJ
AIR INCHEON
2013
4
Asiana Airlines
AAR
OZ
ASIANA
1988
5
Eastar Jet
ESR
ZE
EASTARJET
2009
6
Jeju Air
JJA
7C
JEJU AIR
2005
7
Jin Air
JNA
LJ
JIN AIR
2008
8
Korea Express Air
KEA
XE
KOREA EXPRESS
2009
9
Korean Air
KAL
KE
KOREANAIR
1962
10
T'way Airlines
TWB
TW
TEEWAY
2004 as Hansung Air

Questions and formulas:
Question: What airline has a IATA of BX?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="bx"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,C2:C10="bx"),1))
Level: medium
Question: What is the ICAO for Asiana Airlines?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,A1="asiana airlines"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,A2:A10="asiana airlines"),2))
Level: medium
Question: What is the commenced operation where the ICAO is KAL?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="kal"),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,B2:B10="kal"),5))
Level: medium
Question: What is the ICAO for Air Busan?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,D1="air busan"),2))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,D2:D10="air busan"),2))
Level: medium
Question: What is the callsign where the ICAO is AAR?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,B1="aar"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E10,B2:B10="aar"),4))
Level: medium