From the TSA web site (underlining is mine): "please verify that the airline has your first/middle/last name and correct date of birth — it should match exactly how you applied for the trusted traveler program. For example, if you applied for a trusted traveler program as John David Doe, with David being your middle name, your airline frequent flyer profile and reservation should not be JD Doe; it needs to be consistent – first/middle/last" http://www.tsa.gov/tsa-precheck/freq...sked-questions