I'm sure WePay does not dedicate as much time/effort into understanding every complex industry and in fact they obviously shouldn't. Banking and payments is core to their business. Air travel is not. I would still trust my lawyer if he/she failed to tell me how high I could jump on the moon.

Sure $3.5b is a lot of money and worth mentioning; but just that alone is somewhat misleading considering it's a very small fraction of Berkshire Hathaway.