The DOT strictly prohibits a carrier, agent or tour operator from imposing a price increase after taking a deposit unless the consumer explicitly agrees in writing to a price increase. 14 CFR 399.88; 14 CFR 399.89. Ideally, the DOT wants a separate form for this disclosure and signed consent. Once the consumer makes full payment, the new rules prohibit imposing a price increase for any reason other than an increase in government imposed taxes and fees. Again, this is only permitted if the consumer affirmatively consents in writing to a price increase. To reserve these rights, we recommend that our clients receive a signed compliant disclosure form before taking an initial deposit.