BMI use BD so you may mean BD flight 7, also BD7 is a small airport in British Colombia called Muddy Lake
EVA - a Taiwanese airline uses the Airline IATA Code of BR.
Qantas Airways uses the airline code QF.
KLM
Jet2.com has the IATA airline designator code LS
I believe it is Transaero Airlines
Ryanair: IATA-Code:FRICAO-Code:RYRAirline:RyanairCountry:IrelandCallsign:Ryanair
The cast of Shounen tanteidan BD7 - 1975 includes: Jiro Dan Eiji Iwabuchi Hiroshi Kurosawa Michiyo Yamazoe
EqyptAir's ICAO code is MSR; its IATA code is MS.
The airline code for El Al is LY.
The IATA airline code of Indigo Airlines is 6E.
PX is the IATA code for Air Niugini, the national airline of Papua New Guinea.
I don't know the airline code but maybe you mean the ID of Tallinn airport ( which is EETN ) .