Wear stockings : Wear maternity support hose. You should put on stockings before you get out of bed and keep them on all day. Lie on your back as you pull them on. This will ensure that you start the day right.
Shoe it right: Wear shoes that are comfortable and have expandable gussets or Velcro-type closures that you can easily loosen.
Choose the right seat: In the plane, a seat near the washroom will facilitate more frequent bladder emptying. An aisle seat, thus, would be suitable. Bulkhead seats have the most legroom.
Do some leg work: Every few minutes, lift each leg off the floor as you sit and rotate your foot at the ankle in both directions; then point your toes forward and back a few times. The pumping action will help to keep blood and fluids from pooling in your legs.
Take short walks: Get up and take a short walk down the aisle about once every half hour. This is easiest on a plane if you pre-book an aisle seat. Also, keep yourself hydrated. Avoid coffee, tea, and pop. Instead, drink water or juice.