Yes and please review this Turbo Tax presentation on what volunteer expenses are deductible. You will deduct the expenses in the year these were paid since IRS bases these deductions on a cash year basis. The hotel expense would be reported in your 2023 return since it was paid in 2023.
As far as the upgraded flight, I see no provision that prohibit you from claiming an expense for an upgraded flight. Credit card receipts can be used to substantiate expenses if a receipt is not available.
This IRS powerpoint presentation is also a good reference tool to use since it addresses expenses that volunteers can claim.
@venacontracta
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