From the ALPA app:
International Flights:
When departing the U.S., a jumpseat request may be made at the departure gate (taxes/fees may be collected); however, when departing foreign stations, jumpseat requests must be made at the Delta ticket counter where applicable fees/taxes will be collected. All international jumpseat requests and processing must occur no later than 75 minutes prior to scheduled departure time. OAL pilots, regardless of CASS status, will only receive a cabin seat assignment on international flights.
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