Whether you are picking someone up or heading out of town yourselves, be prepared: DIA is expecting to have its busiest Thanksgiving ever. Officials are recommending you arrive 90 minutes early for domestic flights, and two hours ahead of international departures, even though all 900 screeners are expected to be on duty. The biggest headache may be parking — the economy lots probably will be filled by Tuesday. A site to bookmark: FlyDenver — it can tell you if your flight is on time and the current wait at security. For the latter, you can also call (303) 342-8477 or (303) DIA-TIPS.