Proof of a valid ticket will be required, at least for the time being. Some airlines are allowing customers to present a printed copy of an e-ticket purchase and check-ins at ticket desks may be required. Previously, US travellers could present their driving licence at the flight gate as evidence of an on-line purchase.
According to a report by the Wall Street Journal, the UK’s National High-Tech Crime Unit has asked telephone companies and ISPs to retain traffic data (as opposed to content data) for all communications for the next month as part of the UK’s assistance in the terrorist investigation.