Its not the same thing as for baggage and other rules; the airline on which the most part of the journey is flown, that rule is applied of the corresponding airline.

Even though big airlines have sister airlines, their data is reported separately. Just because they are sister airlines, their data is not merged and masked to gain higher ranking and obscure fault. Check Skytrax (http://www.airlinequality.com/Airlines/AirlineA-Z.htm) to see how these two airlines are reported separately and ranked. Emirates is 4 star airline while Flydubai has not been ranked.There is a difference between Emirates and Flydubai as they are sister airlines BUT Flydubai is not a part/wholly owned subsidy of Emirates. Both the airlines are owned by the government of Dubai but are separate entity. Your argument about "shitty stats and shitty destinations" is not the reason why airlines have subsidies and sister airlines. They have various other reasons for flying to such destinations as demand, aircraft fleet/range and class configurations being the top reasons dues to hub/spoke nature of business that the airlines do. Small airlines like Flydubai are feeder/regional airlines that "feed" passengers in hub(Dubai-in this case) and Emirates will take them onto further longer distances from the hub. From airline operation eyes, Kabul is a "shitty" destination but the demand is there so BOTH Emirates and Flydubai fly to Kabul because of demand and the separate class of people flying back and forth. According to your argument, the 4 star airline Emirates should not be flying to such a "shitty" destination. This is only one example of flying based on destination to argue against your rationale of "sister airline...shitty destinations), I could go on and on with many other examples of airlines and reasons to fly in/out of destinations.

I had outlined the fact in my first posting to this thread about Flydubai and you still were telling people that both Qatar and Flydubai fly B777, so i had to explain what the deal was. The airline industry is not as it looks from the outside and very technical. So yes, Flydubai and Emirates are not the same airlines.

Don't even get me started on the aviation industry of the US, its way complicated than the rest of the world. Ever heard of Skywest airlines? How about Mesa?? Colgan? Pinnacle?? You may not have heard about them but you have flown with them. They are regional airlines of the US (like Flydubai) that are contracted to fly smaller planes and shorter routes on behalf of National/Legacy airlines like Delta, United, American Airlines. Although the flights are flown under the name of the big airlines, using their reservation system/tickets and the same color/paint on the smaller planes- those two are separate entities! American Eagle and American Airlines are not the same company! They have separate pilot unions, separate pay and separate rankings too. Since I am at it, let me tell you something surprising; the first officer of that regional/commuter airline makes roughly $20k the first year flying you under Legacy brand after spending close to 100k in flight training while passengers like you think that he must be working for Delta pulling a 6 figure income! Yes, Emirates and Flydubai are not same and United Airlines and Skywest are not same either!

If you like to further expand your knowledge on the regional airlines of the US, I recommend the following links:

Full documentary