The flight was smooth and the crew was entertaining. 1. It wasn't clear on Kayak that carry-on luggage prices increased to $45 at 24 hour check-in, and $100 at gate 2. Their 24 hour check-in page broke multiple times when attempting to check in 3.
While you cannot choose single on your taxes when you're married, you can file as married filing separately instead. It's similar to filing as a single person, only you acknowledge the fact that you're legally married.
For 2008, Mary can file as Married Filing Jointly with her deceased husband. For 2009, she can file as Qualifying Widower with a Dependent Child and keep the tax benefits of the Married Filing Jointly status. For 2010, Mary can file as Married Filing Jointly or Married Filing Separately. If Mary had not remarried in 2010, she could have filed as Qualifying Widower with a Dependent Child.