Sometimes, it’s pretty enough for getting an upgrade. Just ask the frontline employees of your airline if there’s any possibility to upgrade to first class. Of course, this requires certain preparation: you should look ultimately good and know how to speak to people to make them willing to assist you (keep reading this article and find more details below).
Another important thing to remember is that you do not need to print your boarding pass at the time of online check-in. Many travelers make the mistake of waiting to check-in online until they have access to a printer. Check-in as close to the allowable time and pick up your boarding pass at the airport. With nearly every airline offering several electronic kiosks, gaining a boarding pass will take only a few minutes.
To find out which model of plane you'll be on, look at your travel itinerary. There should be a three-digit aircraft code on it, which can be matched with the codes in brackets on SeatGuru's list. If you can't find it, you should also be able to get the info by getting hold of the airline's flight schedule, which should be downloadable from its site.
Many First Class carriers also have high-end electronic entertainment systems with large screens that offer movies, games, TV shows and music on demand. You will also experience express check-in and boarding through a dedicated area. Some first class airlines provide a pre-boarding lounge that offer amenities such as food, drinks and internet access.
Don’t get me wrong — when I am filing past the first few rows of seats on my way to the back of the plane, those big leather seats with folks already drinking wine in them have a strong allure. But those seats come with a cost, whether in cash or in miles, and on domestic flights you don’t get all that much more than the folks in coach — it’s usually the same meals, albeit for “free,” the same headphones with the same movies or DirecTV, and the same limited seat incline.

Most cash bookings can be upgraded with Avios either at the time of booking or later on, depending on availability. Only the lowest economy (World Traveller) fares (Q, O and G) cannot be upgraded with Avios at any time. There must be reward flight availability in the next cabin for you to be able to upgrade to it using Avios. You won’t be able to upgrade with Avios at the airport or on board. 

First class service was formerly available on intra-European flights on airlines such as British Airways, Lufthansa and Swissair.[4] First class seats were typically configured in a 4-abreast configuration, similar to current North American domestic first class seats, rather than the 6-abreast configuration used for economy and latterly business class services.[5][6]
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