In 2026, Delta Air Lines allows small dogs, cats, and household birds to travel in the cabin on most domestic flights for a one-way fee (typically around $95). The pet must be small enough to fit comfortably inside a ventilated, soft-sided carrier that stows under the seat in front of you. For larger dogs, Delta no longer accepts pets as checked baggage in the cargo hold for standard passengers; only active-duty military members with permanent change of station orders can ship pets this way. All other large dogs must be shipped via Delta Cargo, which requires a more complex booking process through an IPATA-approved agent and is subject to strict "temperature-sensitive" blackouts during the summer and winter. For 2026 travelers, a "pro-tip" is that Delta does not allow pets in the cabin for certain international routes (like the UK, Ireland, or Australia) due to local quarantine laws, so always check the specific "Import Requirements" for your destination country before booking your furry friend's ticket.