Business class starts with line 1 1 regardless of whether the first class has line1; Similarly, whether there are 20 lines in business class or not, economy class starts with line 3 1.
The seats in the first row and emergency exit row of each cabin in economy class are the most spacious, but these seats may be locked by airlines, so-called the most preferred seats, which are provided to passengers who have airline gold card members or pay extra service fees. The specific service fee varies from flight to flight. If you can't choose this golden seat, an aisle seat is also a good choice.
Extended data:
Some airlines provide cradle service for customers with priority seats, and passengers sitting nearby are more likely to encounter babies and affect their sleep. The emergency exit needs to be opened by the passengers next to it in an emergency, so the regulations on seat belts, seats and passengers' physical strength will be stricter.
The aircraft engine is basically located under the wing, and the kitchen and toilet on board are mostly located at the rear of each cabin, so the front seat is less susceptible to the noise of the aircraft, the sound of passengers walking and the noise, and the quieter it is. At the same time, the front seat is less affected by the switch of passenger headlights, which can ensure a good sleep.
The position in the middle of the front row or by the window is the best rest position, which is suitable for passengers who fly for a long time or need to rest urgently. For flights with low attendance or night flights, you can choose the back seat, and you have a certain chance to enjoy single-row seats and lift the handrails to enjoy sleep.