Remove the letters from the aircraft

I take pictures of aircraft. Aircrafts usually have 5 letters on the sides of the tail and under the wings. I wish to remove those letters (crucial) and (remove undesired objects or put simple aircraft on transparent background) (good to have but not always necessary. I will usually have from 3 to 12 pictures per aircraft/project. This would project would be on-going as long as I am in business (20 years?). I can get between 5 to 50 aircrafts per month (depending on the season). I've uploaded some pictures. The pictures starting with 1130 are an example that I did about removing unwanted things to make the aircraft look more attractive. If you are able to remove the entire aircraft and put it on a clean/transparent background, even better. The main part of the job would be to remove the letters, that is the most important part of the job. Usually the letters (ex. C-XXXX) are found under the wings and on the tail (both side) .(see the remaining pictures starting with 20180517. Please let me know if you have any questions. Wishing you the best. Steph