This is purely my opinion. You should consult professional advice (hiring counselor or interview prep) if you are worried about it.

Every airline I've interviewed with requested copies of original college transcripts. Do not lie. That is a show stopper. Your GPA is not.

Do give an answer that feels like you're making an excuse ... "I was busy working 4 jobs, one of them being an instructor" as a reason for your GPA. Turn it into a positive. Show that you've learned from the situation.

IF they ask you about your low GPA, mention something like "While in college, money was tight. I managed to get buy by working 4 jobs. I was a waitor at XYZ, janitor at XYZ, male dancer at XYZ, and I was also a flight instructor at XYZ company. During that time I learned a valuable lesson in that working all of those jobs detracted from educational studies and since I feel education is so important, never again will I allow some financial difficulties affect my studies. One of the things I am proud of is that during that time of turmoil in my life, I was able to maintain a 3.5 GPA in my degree core compentencies."

See how that doesn't sound like it is an excuse anymore but rather someone who has learned and grew up to be a better person because of those experiences?

My high school GPA was very very low ... embarrassing low. I had a good reason for it. But thankfully, nobody mentioned it during an interview.