Old Feb 25, 19, 10:29 am
FlyerTalk Evangelist
Join Date: Jun 2001
Programs: DL 1 million, AA 1 mil, HH lapsed Diamond, Marriott Plat
Posts: 28,174
Call and ask. Under U.S. regulation they're obligated to tell you - but not by how many passengers.

IDB is really now much more rare than people think. See page #37 . https://www.transportation.gov/sites...-2019-atcr.pdf

2,869 IDBs in 3Q18 among reporting carriers with 216 million passengers.
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