I am puzzled about the designation of "regional airline".
So far, I noted that most airlines designated as regional are part of a "main" airline and display a spin-off brand from the main airline identity.
Some examples:
- HOP! (Air France)
- Lufthansa Regional
- Jazz (Air Canada)
The only difference I have noted are the size of the aircraft. They mostly fly Bombardier CRJ, Embraer, perhaps Saab 2000, in general smaller jet or turboprop aircraft with 2+2, eventually 2+1 seating layout, instead of the typical A319/A320/B737 seen in short haul.
All routes I have flown on regional airlines in the past, in Europe at least, are routes I have also flown on "regular" airlines, such as BOD-LYS (Air France A319 and HOP! CRJ900), CDG/ORY-PUF (same), TLS-GVA (Etihad Regional Saab 2000 and easyJet A320 NEO). Such flights did not seem "regional" to me at all, as we crossed a major distance in the country.
Therefore, why do airlines maintain that regional subsidiary brand? Would not that be simpler to unite the whole fleet under one single brand?