Pin flight time information can be obtained via the Package Pins tab within the Vivado tools, both in the I/O planning stage and after synthesis (This Figure).
1. For purposes of understanding footprint compatibility and migration, only the last letter in the package name is relevant. For example, the FFVA2104 and FLVA2104 are essentially the same as far as footprint compatibility and migration due to the last letter "A" being the same.