Numbering conventions vary widely from airline to airline. A few general guidelines apply to most carriers: One- and two-digit flight numbers are generally reserved for long-haul or other premium flights. Flight number 1 is often for an airline’s “flagship” service. Four-digit numbers under 5000 are typically used for regional affiliate …

There are any number of reasons an airline may need to change the aircraft including non-availability of the original plane, requiring a larger or smaller aircraft to match demand on the route, needing to position a particular aircraft for an ongoing flight, etc. When this is done well in advance …

In most situations there is no need to exchange money at home ahead of time. When you arrive, avoid the change bureaus in the airport, train station, or bus depot, and head instead to a bank, post office, or American Express office for the best rates. Some hotels will also …