File(s): File format is application/pdf https://www.frbsf.org/wp-content/uploads/el2002-01.pdf

File(s): File format is text/html https://www.frbsf.org/research-and-insights/publications/economic-letter/2002/01/competition-and-regulation-in-the-airline-industry/

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File(s): https://fraser.stlouisfed.org/title/economic-letter-federal-reserve-bank-san-francisco-4960/competition-regulation-airline-industry-633162