Hi all
Whilst in tenerife we had an apartment which looked upon the flightpath into tfs. Out of interest is there an international standard on how the lights on an aircraft should flash or are they just randomised?
Also on the way out and back I noticed the engines were producing a vapour trail. What actually causes this as I have noticed on some aircraft trails don’t appear ans some they do. No doubt it has something to do with the weather conditions? :confused:

Take a look here: http://www.aerospaceweb.org/question/electronics/q0263.shtml

I presume the vapor you are talking about is a contrail – An artificial cloud created by an aircraft; caused either by condensation due to the reduction in air pressure above the wing surface or by water vapor in the engine exhaust)