Traveling with a 6-month-old is often considered a "sweet spot" because the baby is not yet mobile but is usually on a more predictable schedule than a newborn. When flying, you can choose between a "Lap Infant" (usually free or 10% of the fare) or buying a separate seat for their car seat, which is the safest option. Many long-haul aircraft offer bassinets that attach to the bulkhead wall; these must be reserved well in advance. At 6 months, you should bring a high-quality "travel stroller" that can fold into an overhead bin, or "gate check" your full-sized stroller for free. Regarding gear, "baby-wearing" with a carrier like an Ergobaby is a lifesaver for navigating airports. Remember the TSA liquid rule exception: you are allowed to bring breast milk, formula, and juice in quantities larger than 3.4 ounces, but you must declare them at security for manual inspection. Finally, try to time feedings for takeoff and landing to help the baby's ears adjust to the changing cabin pressure and prevent crying from ear pain.