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AAPA is run as a non-profit association, and is fully funded through annual membership subscriptions, based on an agreed formula …… At current levels, the annual subscription per airline ranges from just under US$100,000 to US$300,000. These amounts, whilst significant, are modest in relation to other costs which an individual airline would need to incur to represent its own interests in the many areas where AAPA plays a useful collective role, enabling such costs to be shared across the entire membership……

These amounts, whilst significant, are modest in relation to other costs which an individual airline would need to incur to represent its own interests 这句如何理解好？