Nothing is illegal about it. A common practice amongst 135 freight dogs is to meet the cargo at a location that is legal for 135 operations. If the original departure airport wx is below 135 minimums, you tell your customer to meet you at a different airport, you then depart your location under 91 since there is no paying freight aboard and meet your revenue at an airport with better wx. It is nothing but a Part 91 ferry operation.
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