I appreciate that times have changed, but in my 40 years on the ground I found that most airlines wanted experienced staff, but how do you get that eperience?
Start wherever you can, in my case it was 1969 in Reservations with BOAC in London. 1 year with them and then down to Australia to TAA in Reservations Melbourne, folllowed by check-in & ticketing in their City Terminal. Next was a move to Qantas at the airport doing all passenger service duties. Along comes American Airlines and a supervisors job. Another few yers with Qantas then followed. By now I had reservations, ticketing, check-in, load control (weight & balance), a little crewing and operations experince. Back to England as a Duty Officer with Monarch. a year later, Senior Duty Officer for Ramp Dispatch section. Then as Airport Manager for ABC (cargo airline) for new base at Luton Airport. Now I also had Ramp, Dispatch, Start-up, Marshaling, Aircraft push-back, ground-air radio to add to my CV. General Manager UK for Altair based at Luton and then my own Airlne Representation Company (Air-Reps (UK) Ltd). A short break away from aviation then back to Australia and 5 years at a 'one-man airport' at Hervey Bay. 3 flights a day (max 36 passengers) where my previous experience allowed me to remain on my own there until size of aircraft operated required more staff. Marshal, check-in, unload/load baggage, reservations, ticketing, you name it I had to do it. The best job I ever had and was very sad when circumstances meant that job ended and I returned to UK. By this time, the airline game was entirely different and I decided to remain outside aviation till retirement which I now enjoy.
So, in a nutshell; if you want a creer on the ground with an airline, get as much experience as you can in as many different sections and with different airlines. Even if you don't particularly like some of the positions, still do them as you'll experience things from a different point of view and it all adds to your overall experience.
I know where you're coming from as aviation was always the job I wanted and I consider myself to have been very, very lucky to have enjoyed so many years doing jobs that I loved.
I wish you all the best.