Unlimited money for Project Wingman

Unlimited money

I don't know whether it's a glitch, I presume it is but I found while playing on the cloud on my series x, as soon as a new plane becomes available, I'm able to sell it even though I haven't bought it, I kept doing this selling the most expensive plane in my inventory, played the next mission and got the more expensive plane and sold that etc. I've now got over 4 million credits and I'm only on the MG-29 plane. I hope this works for people as it has with me.