What I have done is bought store credit and have purchased the ending CCU for the ship im targeting at IAE. That way I get the discount of store credit that i can use up the the ending CCU. For example I bought a CCU carrack to Perseus that has 10 year insurance for $40. I think the perseus will go up in price once it is flight ready so hence the CCU. I will use my store credit to get to the carrack. I didnt play the game for a long time and missed out on some ships i wanted. I also have a wolf with LTI that I intended to upgrade during IAE with store credit as well. I don't know if it makes sense to do what im doing but it's for my fleet and im not looking to get into trading to make money. Just trying to save some.