Student or Learner
Do in terms of / with regard to / in relation to have the same meaning in my sentence?
Unless there are problems in terms of / with regard to / in relation to air traffic control, a Korean flag carrier is free to do anything within our own air space.
You could mean:
"Unless air traffic control is nonfunctional/down ..."
"Unless air traffic control has forbidden/outlawed it ..."
"Unless air traffic control isn't sure whether it's a good idea ..."
"Unless air traffic control is understaffed ..."
All of those terms you've used are often used to avoid writing a more specific and comprehensible sentence.