American Airlines — Flagship Skysleepers / Sinclair

Advertising design

Front shows a red advertising panel with an aircraft illustration beneath “Flagship Skysleepers — Coast-to-Coast Overnight,” followed by American Airlines Inc. and “Largest Airline in the United States.” Back retains the red field and promotes Sinclair Pennsylvania Motor Oil, stating that American Airlines Inc. used it…

Collector market reference

Used: $75–$125 | Unfired/NOS: $250–$375

Book-estimated collector ranges only, not authenticated completed sales or a current appraisal. Values depend on condition and market activity.

Source & documentation

Primary source

POCKET BILLBOARDS by J.H. Kutzley; corrected section master (Airlines).

Photograph source

AIRLINES_SECTION_MASTER_CORRECTED_2026-10-01.docx

Manufacturer and production date

UNKNOWN unless independently documented in the publication and checked for this record.

Original photograph provenance

Embedded photograph bytes retained in this working package; resized, unaltered-framing web copies displayed above. Front/back visual orientation review pending.

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