How to get airline perks
If you travel a lot, it helps to be a loyal flyer and stick to the same airline. This allows you to save miles and it is an easy and cost-effective way to get some perks too. It is very usual if you plan to be a frequent flyer whether for business or pleasure.
Source: History A2Z
Some perks you can get are boarding earlier, access to airport lounges, getting bumped up to first class, and eventually, a free flight. If you travel internationally, make sure you go with an airline that covers all the possible places you have to travel to.
How to choose the best seats
Comfortable seats will make a long-haul flight easier. If you can, take advantage of pre-chosen seats when you buy your tickets instead of letting the airline assign you seats on the big day. You are most likely to get middle seats this way. When choosing, always take note of your preferences.
Source: History A2Z
If you are the type who wants to stretch from time to time, choose an aisle seat. If you will be sleeping most of the time, choose the window seat so you can lean your head on the wall. The window seat is also ideal if you like the view from above. If you think your flight won’t be fully booked, get a seat in the last row. You’d likely end up with no seatmates.