taking dog flying
We had a need to take our 11 yers old Springer Spaniel flying with us because the weather was great, we had no dog sitter and kennels were full. We gave her a check circuit and apart from looking bemused as the ground disappeared settled down. The next day having prepped the plane (DR221) she waited under the wing to be lifted in - so she must have been happy. We use a dog harness (for cars) to secure her to rear seat safty belt, she likes to have something to rest her head on - usually luggage and we make sure that her lead is handy when we lift her from the plane and carry water and a bowl. She has been to West Wales, the Gower (Swansea) Sscarborough (Edsfield) the Isle of Wight and Chaley airshow and has been welcomed (we always advise that we are bringing a dog)
As far as pet passport for european travel we have friends who take their dog by car to france and they have to get her checked 24hours before return also the vaccinations and passport seemed to take about 6 months to activate. I don't know what issues there may be returning