Terrestrial based tracking using the time difference of arrival to calculate position. Should give high positional accuracy during most phases of flight, but position errors can sometimes occur. The ground speed is calculated and can sometimes be incorrect, especially during turns and at low altitudes. Vertical speed is also calculated, so errors can sometimes occur. Altitude data come from the transponder and should be correct. Read more
In August 2012, Travelocity faced a viral controversy when it offered a $200 coupon code to attendees at the National Federation of the Blind annual conference in Dallas. After the NFB posted the code on Twitter without mentioning the attendee restriction, Travelocity re-tweeted it without noticing the error but deleted the tweet a day later. After some travel blogs and message boards resposted the code, many ineligible travelers used the code.[30] Travelocity responded by cancelling all trips that used the code who weren't on the list of attendees at the NFB annual conference. This resulted in a barrage of complaints from customers angry to see their trips suddenly cancelled.[31]

Please be aware that construction is in progress to make improvements to the Terminal Entrance, Roadways and Terminal Parking Lots to provide additional parking spaces for free public parking and to improve the traffic flow to and from the Terminal area. Construction is underway and will continue through the end of November 2018. Signage will be in place for direction along with standard barricading for areas currently under construction for your guidance and safety. Thank you for using Abraham Lincoln Capital Airport and being aware of the construction while you are at at the Airport.
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