Conditions for the validity of Salaah

Q: I have to travel from Dallas to Dubai, how do I calculate onboard prayer time? Flight is for 15 hours approximately.

Q: Is a ladies salaah valid if performed with her baby tied to her back, due to safety reasons when performing salah in a crowded place?

Q: What are the mustahab times for performing all five salaah?

Q: Can women offer salaah in kameez shalwar with hijab or is it mandatory to put on an abaya till the feet? When I say kameez shalwar, I mean the one which is loose and not body revealing.

Q: Can you change Zuhr time of a musjid on heritage day or any public holiday of the kuffaar?

Q: My wife is expecting and colostrum/milk began expelling. I would like to know the following rulings:

1. If the clothing becomes soiled with a few drops, can salaah be performed?

2. After birth, if the clothing becomes soiled with actual breastmilk, can salaah then be performed?

Q: What would be an approximate time that one has to read Asr Salaah from the time Asr sets in until the makrooh time. 

Q:

1. If I start a Salaat at the time of sunrise, zawaal or sunset and then realise the time, must I break the Salaat or finish it?

2. If it's the time of after Asr or after Tahajjud, must I break the Salaat or carry on?

3. Is it the same for fard and Sunnat and nafl Salaat in the two answers for above questions?

Q: Is pre-coital fluid considered najaasate ghaleeza or khafeefah?

Will it invalidate salaah?

Q:

1. Is it necessary for a lady to have her hair covered while sleeping, cooking and when in bed making zikr?

2. Can a lady read salaat with jeans?