What airlines, hotels, and carriers currently require — and where your letter still protects you.
Flying out of Colorado with your animal? The rules differ sharply between ESAs and psychiatric service dogs — here’s what airlines currently require.
Denver International — the country’s largest airport by land area — is Colorado’s hub, applying standard pet fees to ESAs.
The DOT’s 2021 rule change ended mandatory ESA accommodation in the air. Practically, that means pet fees, an under-seat carrier for small animals, and cargo rules for big ones — with details varying by carrier, so confirm before flying out of Colorado.
A psychiatric service dog still flies in the cabin free of charge. Carriers can require the DOT Service Animal Transportation Form — an attestation of training and behavior, usually due 48 hours before departure — and the dog must stay within your foot space, under control.
On the ground, the ADA governs — and it covers task-trained service animals, not ESAs, so hotels and carriers may apply pet policies. Where the letter keeps its force is lodging that counts as housing: leases, sublets, and many longer rentals at your destination beyond Colorado.
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Only under your airline’s standard pet policy — usually a carrier under the seat and a pet fee. Since 2021, airlines aren’t required to treat ESAs as service animals.
A task-trained psychiatric service dog flies in the cabin at no charge. Most carriers ask for the U.S. DOT Service Animal Transportation Form, usually 48 hours ahead.
Hotels are public accommodations under the ADA, which covers service animals — not ESAs — so pet policies and fees can apply. Many Colorado hotels are pet-friendly; confirm before booking.
Yes, but narrowly: incomplete DOT paperwork, disruptive behavior, or space constraints are the recognized grounds.
They do; the DOT framework is domestic, so international trips add the arrival country’s import and vaccination requirements.
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