Can travel agents use their miles to purchase tickets for customers without first notifying them?

My friend purchased a plane ticket with this and when he tried to link his frequent flier account with the reservation, the airline told him that he cannot earn miles with this since it was purchased with frequent flier miles. I understand tickets purchased with miles cannot accrue miles, but the travel agent never alerted [...]

Deduct travel expenses from tripif photographing scenics & submitting them to stock photo businesses?

I’m a retired pro photographer and want to travel (with my husband as assistant) and take photos to submit to stock photography companies. Scenics, local cultures, wildlife, etc.
How much of my travel expenses can I legally deduct from my USA income tax? Opinions? Experiences?